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10CFR50.73

November 30, 1994NRC-94-0111

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U. S. Nuclear Regulatory Commission +

Attention: Document Control Desk ;

Washington, D.C. 20555;

Reference: 1) Fermi 2NRC Docket No. 50-341NRC License No. NPF-43

1

Subject: Licensee Event Report (LER) No. 94-007 |.

Please find enclosed LER No. 94-007, dated November 30, 1994, for a ,

reportable event that occurred on October 31, 1994. A copy of this LER isalso being sent to the Regional Administrator, USNRC Region III.

If you should have any questions, please contact Joseph H. Pendergast,Compliance Engineer at (313) 586-1682.

Sincerely, I

fh$YEnclosure: NRC Forms 366, 366A '

cc: T. G. ColburnJ. B. MartinH. P. PhillipsP. L. Torpey ;

A. Vegel

Wayne County EmergencyManagement Division

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050011

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NRC FORM 366- U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMS NO. 3150-0104(54 EXPIRES 5/31/95<

E STiMA TED BURDEN PER RESPONSE TO COMPLY #TH THIS

LICENSEE EVENT REPORT (LER) |$$2I$ta%"JCRo#fst',Jio"", E M,%T%"

AND Rf COROS MANAGEYENT BRANCH [MN92 77141. U S. NUCLEARREGULATORY COM%SSIGN. WASHINGTON. DC 20%S DCC1, AND TOTHE PAPrPWORK REDUCTION FHCUECT 13150 0101L OrRCE OF

(See reverse for required number of digits / characters for each block) MANA3EMWT AND BUDGET, WASHINGTON. DC 20503. *

f ACILITY NAME (1) DOCKET NUMBER (2) PAGE p)

Fermi 2 05000 -341 1 OF4

TITLE (4),

Improperly Installed Control Center Heating Ventilation and Air Conditioning Duct HangerEVENT DATE (5) LER NUMBER (6i REPORT NUMBER (7) OTHER FACILITIES INVOLVED (8)

'"N'* " ' " " "sEaufNTx RevsoNmon *H DAv vEAR vo^" "'N'" U^* **"NuusEn NuveER 05000F ACIU1Y NAVE DOCKET NUMBER i

10 31 94 94 " 007 ~

00 11 30 94 05000 i

OPERATING THIS REPORT IS SUDMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR O (Check one or more) (11)- MODE (9) 4 20.402(b) 20.405(c) 50.73(a)(2)(iv) 73.71(b)

POWER 20 405(a)(1)(i) 50.36(c)(1) 50.73(a)(2)(v) 73.71(c) |LEVEL (10) 000 20 405(a)(1)(ii) 50 36(c)(2) 50.73(a)(2)(vii) OTHER

20.405(a)(1)(in) 50 73(a)(2)(i) 50.73(a)(2)(vin)(A) PP*dY '" Ab'"ac'

20 405(a)(1)(rv) X 50 73(a)(2)(ii) 50.73(a)(2)(viii)(B) [a20 405(a)(1)(v) 50.73(a)(2)(iii) 50.73(a)(2)(x)

LICENSEE CONTACT FOR THIS LER (12) j

NAMt TELLFtiONL NUMOLH pnciade A'ea Godel

Joseph M. Pendergast, Compliance Engineer (313) 586-1682COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

CAbbf SYSTEM COMPONE NT MANurACTURER CAUSE SYSTE M COYPONE NT MANUFACTURERp

|

SUPPLEMENTAL REPORT EXPECTED (14) EXPECTED V^i" U^Y 4^4

yrs SUBMISSION iy gos p , uwe rxPrcTEo suaM ss,0N DAin

DATE (15) j

ABSTRACT (Umit to 1400 spaces, i e., approximately 15 single-spaced typewritten lines) (16) |

On October 27, 1994 the insulation was removed from the control center heating!ventilation and air conditioning [(CCHVAC)(VI)] return air fan discharge duct{as part of the implementation of Engineering Design Package [EDP] 26868 forifire damper modifications. On October 31, 1994 engineering personneli

determined that a nine foot length of C channel, which had been wedged againsta piece of unistrut and partially wrapped inside the duct insulation, had not I

been seismically supported. The channel is located above the control roompanel H11-P808 containing controls for both safety related and non safetyrelated plant equipment. The cause of the problem was an engineering errorwhich occurred in 1983 when the structural channels were unbolted from thecontrol room ceiling. To correct the situation, the affected (south) channelhas been welded to the adjacent channels, and the south channel was re-boltedto the control room ceiling. Engineering has revised (i.e., posted) thedrawing which specifically references the weld configuration of this structuralchannel and has conducted a review of similar configurations.

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REQUIRED NUMBER OF DIGITS / CHARACTERS 1

FOR EACH BLOCK )

'BLOCK NUMBER OFTITLENUMBER DIGITS / CHARACTERS

1 UP TO 46 FACILITY NAME

8 TOTALDOCKET NUMBER3 (N ADDITION TO 05000

3 VARIES PAGE NUMBER

4 UP TO 76 TITLE y

6 TOTALEVENT DATE2 PER BLOCK

7 TOTAL^

6 LER NUMBER3 FOR SEQUENTIAL NUMBER

2 FOR REVtSION NUMBER

7 REPORT DATE2 PER BLOCK

UP TO 18 - FACIUTY NAME

8 OM FAOLITIES MOLVED8 TOTAL ~ DOCKET NUMBER3 IN ADDITION TO 05000

9 1 OPERATING MODE

10 3 POWER LEVEL

II REQUIREMENTS OF 10 CACHECK BOX THAT APPLIES

UP TO 50 FOR NAME12 LICENSEE CONTACT

14 FOR TELEPHONE*

CAUSE VARIES2 FOR SYSTEM

13 4 FOR COMPONENT EACH COMPONENT FAILURE4 FOR MANUFACTURER

NPRDS VARIES

" S ENTAL REPORT EFECTEDCHECK BOX THAT APPLIES

| 15 EXPECTED SUBMISSION DATE2 PER BLOCK

_ _ _ _ - - - . _ _ _ _ _ _ _ . _ _ - _ _ - _ _ - _ _ _ _ _ _ _ _ _ _ _ - - _ . _ - _

e

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HRC FQRM 166A U.S. NUCLEAR REGULATORY CoMMISSloN APPROVED BY oMB No. 3150-0104ro sa

, EXPIRES 5/31/95EST; MATED BURDEN PER RESPONSE TO COMPLY WrrH TH!S

LICENSEE EVENT REPORT (LER) 5 ""0S %EGEEnDEN EIJ OO ,MSM!r'$"* "

TEXT CONTINUATION @u"yj 8 j'N'i"3 NCH|ME B 4 SN

cM s , r ,

TME PAPERvv0RK REDUCTION PROJECT pts >o104;, OFFICE OFMANAGEMENT AND BUDGET, WASHINGTON. DC 20503-

FACILITV NAME (1) DOCAET NUMBER p) LER NUMBER (6) PAGE (3)bEQUENT aA, REv@ONNUMBER NUMBE R 1Fermi 2 05000-341 2OF4 |

94-

007-

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Initial Plant Conditions: |

Operational Condition: 4 Cold ShutdownReactor Power: O PercentR: actor Pressure: O psig !Reactor Temperature: 160 degrees Fahrenheit

Description of the Event:

On October 27, 1994 the insulation was removed from the control center heatingventilation and air conditioning [(CCHVAC)(VI)] return air fan discharge ductas part of the implementation of Engineering Design Package [EDP] 26868 forfire damper modifications. On October 31, 1994 engineering personneldetermined that a nine foot length of C channel, which had been partiallywrapped inside the insulation had not been seismically supported. The Cchannel was being held in place by the insulation and a close physical fitbetween the duct and a nearby unistrut tubing support. Upon discovery thecaterial was secured in place and an investigation of the design was initiated.

A review of the design history revealed that in 1977 this C channel was part ofa duct support which had been bolted to the control room ceiling. The north,cast, and west supports were welded to steel plates which were each welded tothe duct. However, the south support was bolted to the ceiling, but was notwelded to the duct, probably because of its location at the inside radius of anolbow in the duct. Original as-built design drawings had been updated toreflect this configuration.

In 1983 a design change was implemented to allow for CCHVAC duct thermal i

expansion during a fire. The bolts attaching the structural channels to thec3111ng were removed. Insulation covered the mated surface between the flangeof the C channels and the duct, obscuring the absence of welds from the channelto the duct for the south channel during the 1983 modification.

The channel is part of a hanger that is located above the control room panelH11-P808 which contains controls for both safety related y d non safety relatedequipment including standby gas treatment [VL], CCHVAC, engineered safetyfcature room coolers [VA), emergency diesel generator ventilation [VJ), torushardened vent [VLR], and remote manual containment isolation valves [ISV). The '

duct hanger, which is within the control room envelope, is required to ber.cismic category I or II/I and therefore, the condition described above is ;

considered a condition outside the design basis.i

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NAO FOAM 3664 IS 92;

_.

NRC FORM 366A '

U.S. NUCLEAR HEGULATORY COMMISSION APPROVED BY oMB No. 3150-0104is % EXPtRES 5/31/95

ESTlMATED BURDEN PER RESPONSE TO COU%V W'TH THis

LICENSEE EVENT REPORT (LER) C$$7'JOtEESE"RDf$TE'E"o D M E%TS'' " '

TEXT CONTINUATION Q$u?Ms ugs syg9r;u sa7;ggNgg;CHe cc

THE PAPERWOW REDUCTION PRCUECT (3150 0104,, OFFICE OFMANAGEMENT AND BUDGET, WASHrNGTON, DC 20503

F ACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

ht OVEN 1 aA. REv;SaON

NUMBER NUMBERFermi 2 05000-341 3OF4

94 - 007-

00TEXT (If rnare spece os reprea use acastronet cop **s of htHC form 3%4) (1 75

Cause of the Event:

The cause of the problem was an engineering design change process error whichoccurred in 1983 during the initial construction of the plant when designchange request "H-0980", revision "A" unbolted the channel from the controlroom ceiling. The error involved utility non-licensed, and contractnon-licensed personnel who prepared and approved the design change request.This error is attributed to two possible causes.

1) The field design engineers may have incorrectly interpreted the hangerdrawing in 1983 when the ceiling bolts were removed. The hanger drawingrefers to two inch welds every five inches along this support as " typical"to hold the duct to the structural channels. However, it was not obviousfrom the drawing that this entire section of C channel was not welded inplace.

2) The field and design engineers did not perform an adequate field walkdownto identify the weld configuration for the structural channels.

Analysis of the Event:

. Structures important to safety are required to be designed to withstand theioffects of natural phenomena such as earthquakes. The specific criteria for 1

the control room is seismic category I or II/I for structures and components. |

The south structural C channel for the CCHVAC return air fan discharge ducthinger did not meet this seismic criteria. Therefore, the condition describedla reportable in accordance with 10CFR50.73(a)(2)(ii)(B) for a conditionoutside the design basis. The actual probability of the south channel fallingon the H11-P808 control panel during a seismic event appears small whenconsidering: 1) The tight geometry of structures and components above thecontrol room's suspended ceiling. 2) And those structures and components ared signed to meet seismic category I or II/I criteria.

Corrective Actions:

EDP 26868 was revised to have the south structural channel welded to theedjacent structural channels, and to have the structural channels rebolted tothe control room ceiling. A new fire damper was also installed that does notrequire space for duct thermal expansion at this location. EDP 26868 postedchanges against vendor drawing 2849 17 for the CCHVAC return air fan dischargeduct hanger to specifically reference the weld conff guration of the structuralchannels.

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NRO FORV 366A (5 $2;

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e

NRC FQRM 366A *

U.S. NUCLEAR REGULATORY COMMISSloN APPRoVEo BY oMB No. 3150-0104,

* *hEXPIRES 5/31/95,

EST! MATED BVRDEN PER RESPONSE TO COMPLY WfTH THis

LICENSEE EVENT REPORT (LER) E"T'jDEa'OMSORo"#EEAT7 ?o ""* ,NF1"%2M

TEXT CONTINUATION AN MC R S MANAMMENT BAANCH (MWB MML U S NAEARREGULATORY COMMtSSON, WASHINGTON, DC MSSF,,01, AND TOTHE PAPERWORK REOUCTON PROJECT (31540104), OFFICE OFM ANAGE MENT AND BUDGET, WASHtNGTON, DC 20$03

L_F ActLITY NAME 0) DOCKIT NUMBER (2) LER NUMBt H (S) P AGE (3)

bE QVE N 11 A. MVisiONyggNUMBE R NUMBER

Fermi 2 05000 -341 4OF494 - 007

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00TExs cai n. ,v.c. ..e..r u . .nw ee.. r wo- xs o n

,

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Engineering personnel have inspected all accessible fire damper modifications,performed in the 1983 time frame which unbolted hangers or other members from I

w211s, floors and ceilings to assure the hangers and members are appropriatelyattached to the duct. No cther seismic problems were found. One previouslyidentified discrepancy was observed that does not, impact the seismicqualifications of the equipment and is being dispositioned within theCorrective Action Program.

|Previous Similar Events: 1

There are no previous similar events.

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