05000296/LER-1979-020-03, /03L:on 791120,during Refueling Outage,Secondary Containment Integrity Lost When Both Hatches in Personnel Air Lock from Turbine Bldg to Reactor Bldg Opened Simultaneously for 15-s.Caused by Bent Door Lock Bolt

/03L:on 791120,during Refueling Outage,Secondary Containment Integrity Lost When Both Hatches in Personnel Air Lock from Turbine Bldg to Reactor Bldg Opened Simultaneously for 15-s.Caused by Bent Door Lock Bolt

ML18024B193
Person / Time
Site:	Browns Ferry
Issue date:	12/19/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B192	List: 05000296/LER-1979-020, Forwards LER 79-020/03L-0 05000296/LER-1979-020-03, /03L:on 791120,during Refueling Outage,Secondary Containment Integrity Lost When Both Hatches in Personnel Air Lock from Turbine Bldg to Reactor Bldg Opened Simultaneously for 15-s.Caused by Bent Door Lock Bolt
References
LER-79-020-03L-01, LER-79-20-3L-1, NUDOCS 7912270574
Download: ML18024B193 (4)

LER-1979-020, /03L:on 791120,during Refueling Outage,Secondary Containment Integrity Lost When Both Hatches in Personnel Air Lock from Turbine Bldg to Reactor Bldg Opened Simultaneously for 15-s.Caused by Bent Door Lock Bolt

Event date:
Report date:
2961979020R03 - NRC Website

text

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LICENSEE EVENT REPORT

. NUCLEAR REGULATORY COMMISSION [OD1) 7 8

CON'T

~01 7

8 CONTROL BLOCK:

QI

'I 8

A L

B R

P 3

Q2 0

0 -

0 0

0 0

9 LICENSEE CODE 14 15 LICENSE NUMBER (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 0>

04~ 08 26 LICENSE TYPE 30 57 CAT 58 s

y 9

7 9

QB EVENT DATE 74 75 REPORT DATE 80 sOURcE LJO 0

5 0

0 0

2 9

6 7

60 61 DOCKET NUMBER 68 69 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 With unit 3 in a ached le e

seconda containment inte rit was lost when both hatches in the ersonnel ai lo k

~O4 from the turbine buildin to the unit 3 reactor buildin were o en si e

~o 6

about 15 seconds.

There was no resultin si nificant chain of events and no dan er to

~o 6

health or safet of the ublic.

Previous occurrence BYRD-50-260 15

~O7

~OB 7

8 9

80

~OB 7

8 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~sA QTT

~B 072

~B0>>>>>>

z 04

~z 0,.

Lzl 0" 9

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LERJRO EVENT YEAR REPORT NO.

CODE TYPE NO, Q17 REP0RT ~79

~

LDOI

~M

~0 UL LJ U0 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDQ PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER QIB ~QIB

~Q20

~ZQ21 0

0 0

0

~Y Q23

~Q24 QJQ25 GB 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

On the ersonnel a

was found to be sticking.

The lock bolt was removed and was found to be bent lock bolt was straightened,

replaced, relubricated, and operated satisfactoril Re-3currence control is being studied.Wagstaf f do or 249,Lock Model 540ModeraTMSPH HD-26D.

7 8

9 FACILITY

~30 METHOD OF STATUS YP POWER OTHER STATUS PQ DISCOVERY 8

N Q28 ~00 0

Q28 NA

~3037 DAR 8

9 10 12 13 44 45 46 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ 6

~Z Q33 ~Q34 NA 7

8 9

10 11 44 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q3B 7

~00 0

Q37 Z Q38 NA 7

8 9

11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTIONQ41 8 ~00 0

Q48 NA 7

8 9

11 12 LOSS OF OR DAMAGE TO FACILITYQ43 TYPE

DESCRIPTION

~IB Z 042 8

9 10 PUBLICITY ISSUED DESCRIPTIONQ

~2O

~NQ44 NA 7

8 9

10 NAME OF PREPARER DISCOVERY DESCRIPTION Q32 80 LOCATIONOF RELEASE Q 80 80 80 80 NRC USE ONLY 80 PHONE 2 97 8820+QoQ

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Thnnt:ssee Ua y Authority Brow;rs Ferry uclear Plant 0

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>/>0/r9 LER SUPPLEMENTAL fNFORMATION BFRO-50'259 /

7920 Technical Specification Involvecl BE ported Unde.

Technical Specification Date, if Occurrence 1~120~79 Time of Occur rence 2 pp 2.jpr.it identification and DescriL>tiorr of Occurrence:

Loss of secondary containment integrity when prirrrary containment did not exist.

Both hatches in the personnel air lock from the turbine building to the unit 3 reactor building were simultaneously open'or about 15 seconds.

e Conditions "Prior to Occurrence:

Unit 1 at 690 MWe.

Unit 2 at 1095 MWe.

Unit 3 in refueling outage.

Action'pecified in the Technical Specification Surveillance Req>> rer..ents met

<iue te ine~erahh e<tu~itaent.

Describe.

NA App'rrent Cause of Occurrence:

Lock bolt on unit 3 side air lock door was bent.

Angels'is af Occurrence:

No danger to health or safety of the public of no significant resulting events.

Corrective Action

Rock looXt~sra~gtened and door operability verified.

A memo to Engineering Design willbe written to request an evaluation and,corrective action.

Failure Data:

NA

~Retention:

• Revision:

eriod - LU'ctime; Responsibility

- Administrative Superv>>or

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