05000302/LER-1981-011-01, /01T-1:on 810306,containment Isolation Valves CAV-1,3,4,5 & 126 Found Incapable of Meeting Environ Qualification During Evaluation of IE Bulletin 79-01B.Caused by Potential Electrical Short Due to Flooding After LOCA

/01T-1:on 810306,containment Isolation Valves CAV-1,3,4,5 & 126 Found Incapable of Meeting Environ Qualification During Evaluation of IE Bulletin 79-01B.Caused by Potential Electrical Short Due to Flooding After LOCA

ML19343C577
Person / Time
Site:	Crystal River
Issue date:	03/20/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19343C575	List: 05000302/LER-1981-011, Forwards LER 81-011/01T-1 05000302/LER-1981-011-01, /01T-1:on 810306,containment Isolation Valves CAV-1,3,4,5 & 126 Found Incapable of Meeting Environ Qualification During Evaluation of IE Bulletin 79-01B.Caused by Potential Electrical Short Due to Flooding After LOCA
References
IEB-79-01B, IEB-79-1B, LER-81-011-01T, LER-81-11-1T, NUDOCS 8103240536
Download: ML19343C577 (2)

LER-1981-011, /01T-1:on 810306,containment Isolation Valves CAV-1,3,4,5 & 126 Found Incapable of Meeting Environ Qualification During Evaluation of IE Bulletin 79-01B.Caused by Potential Electrical Short Due to Flooding After LOCA

Event date:
Report date:
3021981011R01 - NRC Website

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SUPPLEMENTARY INFORMATION

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Report No.:

50-302/81-Oll/0lT-1 Facility:

Crystal River Unit 3 Report Date:

11 arch 20,1981 Occurrence Date:

March 6, 1981 Identification of Occurrence:

Containment isolation valves CAV-1, 3, 4, 5, and 126 are not capable of meeting the environmental qualifications of I. E.

Bulletin 79-01B due to submergence following a Loss of Coolant Accident (LOCA).

Conditions Prior to Occurrence:

Mode 1 power operations (46%).

Description of Occurrence:

At 1630 during evaluation of I. E. Bulletin 79-01B, it was discovered through conversations with the vendor and through engineering analysis, that ' containment isolation valves CAV-1, 3, 4, 5, and 126 would not meet the environmental qualification requirements due to submergence following a LOCA.

Designation of Apparent Cause:

The cause is attributed to potential electrical short due to flooding in the Reactor Containment following a LOCA.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public. Containment isolation valves CAV-2, 6, and 7 provide redundant isolation capability.

Corrective Action

Emergency Procedure EP-106 is being revised to instruct an operator to close and de-energize the subject valves in event of a LOCA.

In the interim, a Short Term Instruction has been issued which maintains these valves closed and de-energized ex-cept when needed for sampling. An engineering evaluation is in progress to resolve this potential problem.

Failure Data:

This is the first occurrence or event of this type and the first event reported under I. E. Bulletin 79-01B.

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