ML20040G579

Proposed one-time Change to Tech Spec 4.7.10.4,extending Required Surveillance Interval for Hydraulic Snubber Functional Test

ML20040G579
Person / Time
Site:	North Anna
Issue date:	02/05/1982
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20040G575	List: ML20040G574 ML20040G579
References
NUDOCS 8202160269
Download: ML20040G579 (2)

Text

. 4 Attcchment 1

-3a-(b) The end of the current surveillance period for the Surveillance Requirements listed below may be extended beyond the time limit specified by Technical Specification 4.0.2.a. In each case, the required surveillance shall be completed by the revised due date.

After May 31, 1981 the plant shall not be' operated in Modes 1,.

2, 3, or 4 until the Surveillance Requirements listed below have been. completed. Upon accomplishment of the surveillance, the provisions of Technical Specification 4.0.2.a shall apply.

Specification 4.8.2.3.2.d 4.8.2.4.2 (c) The end of the current Surveillance period for the Surveillance Requirement listed below may be extended beyond the time limit specified by. Technical Specification 4.0.2.a. The required surveillance shall be completed prior to the startup after the refueling outage. The plant shall not be operated in Modes 1, 2, 3 or 4 until the Surveillance Requirement listud below has been completed. Upon accomplishment of the surveillance, the provisions of Technical Specification 4.0.2.a shall apply.

Specification 4.7.10.c i

'9202160269 820205 PDR ADOCM 05000339 P PDR A

m Attachment 2 DISCUSSION OF PROPOSED OPERATING LICENSE AMENDMENT \

Technical Specification Su rveillance requirement 4.7.10.4 requires that hydraulic snubbers be functionally tested each refueling outage (every eighteen months). The initial hydraulic snubber testing was performed on 4-8-80 and surveillance was due to be completed again on 2-23-82 (this date

includes the allowable 25% extension).

Due to the large number of snubbers which must be functionally tested (in excess of 70 for the Periodic Test plus a similar number for seal replacements in accordance with the Snubber Service Life Seal Replacement Program, T. S.

4.7.10.c), this surveillance can best be performed during a refueling outage.

The first refueling outage begins approximately 3-5-82. In light of the short operating time expected after expiration of the allowable surveillance interval until commencement of the refueling outage (approximately two weeks) and based on the surveillance history, a one-time extension of the snubber functional test surveillance interval is justifiable.

The proposed extention of the snubber surveillance interval does not involve

_ an unreviewed safety question. The margin of safety is not reduced since the current surveillance sampling program functionally tests more than twice as large a sample as required by Technical Specifications due to stubber seal replacements. This increased sample size increases the margin of safety by improving the probability that a failed snubber will be detected. A one-time increase in the surveillance interval decreases the probability that a failure will be detected, but the increased margin afforded by the much larger sample size results in an overall increase in the margin of safety.

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