05000260/LER-1981-019-01, /01T-0:on 810425,bypass Installed on Main Steam High Temp Isolation Relays to Control Unit Conditions for Maint on Ventilation Sys.Caused by Electrical Components Malfunction.Repairs Initiated & Ventilation Restored

/01T-0:on 810425,bypass Installed on Main Steam High Temp Isolation Relays to Control Unit Conditions for Maint on Ventilation Sys.Caused by Electrical Components Malfunction.Repairs Initiated & Ventilation Restored

ML19347E625
Person / Time
Site:	Browns Ferry
Issue date:	05/07/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19347E620	List: 05000260/LER-1981-019, Forwards LER 81-019/01T-0 05000260/LER-1981-019-01, /01T-0:on 810425,bypass Installed on Main Steam High Temp Isolation Relays to Control Unit Conditions for Maint on Ventilation Sys.Caused by Electrical Components Malfunction.Repairs Initiated & Ventilation Restored
References
LER-81-019-01T, LER-81-19-1T, NUDOCS 8105130147
Download: ML19347E625 (2)

LER-1981-019, /01T-0:on 810425,bypass Installed on Main Steam High Temp Isolation Relays to Control Unit Conditions for Maint on Ventilation Sys.Caused by Electrical Components Malfunction.Repairs Initiated & Ventilation Restored

Event date:
Report date:
2601981019R01 - NRC Website

text

NHC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

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60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCalPTION AND PROBA8LE CONSEQUENCES h

.I o 121 l While operating at full power stea y state a bypass was installed on MSL high tempera-l d

ture isolation relays to control unit conditions until the ventilation system could be; j o,3 ; ;

l returned to service or a controlled shutdown initiated and MSIV's closed per T.S.

,; o ; 4 l l o I s l l Note 3.2. A. l.B.

A reactor operator was stationed at the main steam tunnel temperature; There was

o is i ; monitor to isolate main steam lines if temperature reached T.S. limits.

l BFRO-50-260/8117.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVC ACTIONS h l i 1 o l l Malfunction of Rx buildtr ; ventilation system electrical components. Repairs were

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li ii i i initiated, ventilation restored, and the bypass removed within 48 minutes. Personnel l l

l,12 I I were stationed to monitor temperature as stated above. MSIV isolation signals from l

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6Tenntssee Valley Authority Form BF-17 Browns Fcrry Nuclsar Plant BF 15.2 3/04/81 LER SUPPLEMENTAL INFORMATION BFRO-50 _260 / 8119 Techni::a1 Specification Involved 3.2.A Table 3.2.A Reported Under Technical Specification 6.7.2.a.5 Date of Occurrence 4/25/81 Time of Occurrence 1030 Unit 2

Identification and Descriotion of Occurrence:

While operating at full power steady state a bypass was installed on main steam line high temperature isolation relays to maintain control of unit conditions until

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the ventilation system could be returned to service or a controlled shutdown initiated and MSIV's closed per T.S. Note 3.2.A.l.B.

Conditions Prior to Occurrence:

Unit 1 at refueling outage.

Unit 2 at 100%

Unit 3 at 95%

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

A rcactor operator was stationed at the main steam tunnel temperature monitor with instructions to isolate the main steam lines if the temperature reached T.S. limits.

T Apparent Cause of Occurrence:

Malfunction of reactor building ventilation system electrical components, which put the plant outside the applicable LCO.

Analysis of Occurrence:

There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no danger to the health or safety of the public.

Corrective Action

Repairs were made and the requirements of the applicable LCO were satisfied.

j Failure Data:

NA

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• Retention :

Period - Lifetime; Responsibility - Document Control Supervisor

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• Revisica:

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