05000327/LER-1980-157-03, /03L-0:on 800911,containment Isolation Valve FCV-61-192 Took 20-s to Stroke Closed.Caused by Ice Buildup. No Subsequent Problems Have Been Experienced

/03L-0:on 800911,containment Isolation Valve FCV-61-192 Took 20-s to Stroke Closed.Caused by Ice Buildup. No Subsequent Problems Have Been Experienced

ML19344B577
Person / Time
Site:	Sequoyah
Issue date:	10/10/1980
From:	Cottle W, Kirk G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19344B575	List: 05000327/LER-1980-157, Forwards LER 80-157/03L-0 05000327/LER-1980-157-03, /03L-0:on 800911,containment Isolation Valve FCV-61-192 Took 20-s to Stroke Closed.Caused by Ice Buildup. No Subsequent Problems Have Been Experienced
References
LER-80-157-03L, LER-80-157-3L, NUDOCS 8010210517
Download: ML19344B577 (2)

LER-1980-157, /03L-0:on 800911,containment Isolation Valve FCV-61-192 Took 20-s to Stroke Closed.Caused by Ice Buildup. No Subsequent Problems Have Been Experienced

Event date:
Report date:
3271980157R03 - NRC Website

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EVENT oESCRIPTION Af40 PROSABLE CONSECUENCES h [Di: } [ On 7/27/80 containnent isolation valve FCV-61-192 (glycol system isolation valve) took I o i a j i approximately twenty' seconds to stroke closed. This condition was noted by a test

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o Tennessee Valley Authority Sequoyah Nuclear Plant LER SUPPLD'. ENTAL INFORMATION SQRO-50-327/80157 Technical Specificatien Involved 3.6.3.1 Reported Under Technical Specification:

6.9.1.13.c Date of Occurrence: 9/11/80 Identification and Description of Occurrence:

An entry in a test engineer's daily log dated 7/27/80 noted that FCV-61-192 took approxi=ately twenty seconds to stroke closed (timed with wrist watch).

The test engineer was trouble shooting problems identified during the per-formance of TVA-56, ESF Reset Controls. The cycling of FCV-61-192 was not a part of the for=al test and, as sach no acceptance criteria was given. The test engineer did not identify that condition t.o the Shift Engineer and no subsequent action was taken on the valve. The condition was identified on 9/11/80 during a NRC review of T7A-56 date.

Conditions Prior to Occurrence:

Unit 1 in rede 5.

Testing in progress for ESF reset design verification.

Action specified in the Technical Specification Surveillance Requirenents net due to inocerable ecuipment.

N/A Accarent Cause of Occurrence:

Ice buildup on FCV-61-192 caused valve to cycle slower than design.

Analvsis of Occurrence:

A review of the surveillance testing on FCV-61-192 prior to and af ter 7/27/80 revealed the following:

Date Time 6/130lIO 7.5 See 8/24/80 9.2 See Excess coisture apparently resulted in a buildup of ice on the valve. Cycling of the valve on 7/27/80 freed the valve up and subsequent operation has been satisfactory.

Corrective Action

Valve cycle times were reviewed with no indication of valve inoperability either prior to or following the condition noted on 7/27/80. Operating experience of all glycol isolation valves will be reviewed to deter =ine if a routine progran of cycling these valves is warranted.

All preoperational test personnel have beta cautioned to identify discrepancies noted during testing to the Shift Engineer if the discrepancy involves Unit i equipcent.

Failure Data:

N/A