ML18113A760

LER 78-049/03L-0 on 781219:conduct of PT-39B Revealed 2 Snubbers W/Fluid Levels Less than Target Level.Caused by Leaking Tube Fittings

ML18113A760
Person / Time
Site:	Surry
Issue date:	01/02/1979
From:	Baucom T VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A757	List: ML18113A756 ML18113A758 ML18113A759 ML18113A760
References
LER-78-049-03L, LER-78-49-3L, NUDOCS 7901090234
Download: ML18113A760 (2)

Text

m:ic FORr..i 366 U.S. NUCLEAR REGULATORY COMMISSION

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-ICENSEE EVENT REPORT e CONTROL Ei LOCK: ~I-~~--'----'---'--......jl6 G) 1 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION}

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jWith the unit at cold shutdown, conduct of PT-39B reveale_d two snubbers with fluid levels less than target level. An engineering eva'iuation determined these snubbers

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~ Ito be inoperable. This event is reportable in accordance with T.S. 6.6.2.b.(2). Unit!

[III] 1 operation was normal from startup to shutdo,~). The health and safety of the public

[IT[) !were not affected.

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REPORT NUMBER I7 j 8/ L=.l 10 j4 !9 I I/I 10 13 J l2:J L=J ~

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42 43 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

jThe cause of the low fluid levels was leaking tube fittings. One snubber was re-OJJJ !placed and one was repaired and restored. to operable condition. Tube fittings are a part of the visual acceptance criteria for surveillance of snubbers: All snubbers

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' will be inspected prior to unit startup.

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?ERSONNEL EXPOSURES NUMBER Q TYPE 11 DESCRIPTION 39 f 44 45 80 EI2J 10 10 10 !~@,___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _____.

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T. L. Baucom (804) 357-3184 0 NAME OF P R E P A R E R - - - - - - - - - - - - - - - - - - ll.

PHONE:-------------

W\ttachment, page 1 of 1)

Surry Power Station, Unit Docket No: 50-280 Report No: 78-049/0JL-0 Event Date: 12/19/78 Title of Report: Inoperable Snubbers

1. Description of Event:

With the unit at cold shutdown, conduct of PT-39B revealed two snubbers, 1-RC-HSS-119 and 1-RC-HSS-135, with fluid levels less than target level. An engineering ~valuation on 12/19/78 determined these snubbers to be inoperable.

This event is reportable in accordance with Tech. Spec. 6.6.2.b.(2).

2. Probable Consequences of Event:

Since two snubbers represent a very small percentage of the total seismic restraint installation and since these restraints are provided for a low proba-bility event, and unit operation was normal from startup to shutdown, the health and safety of the public were not affected.

3 *. Cause of Event:

The cause of the low fluid levels was leaking tube fittings.

4. Immediate Corrective Action:

Snubber l-RC-HSS-119 was replaced with a Q.C. certified shop spare. The leaking fitting on snubber 1...:RC-HSS-135 was repaired and the reservoir level was restored to the proper level.

5. Subsequent Corrective Action:

Prior to *.unit startup, all snubbers will be verified operable by visual inspection criteria.

6. Action Taken to Prevent Recurrence:

Tube fittings are a part of the visual acceptance criteria for surveillance of snubbers. All snubbers will be inspected prior to unit startup.

7. Generic Implications:

The generic implications are those associated with hydraulic systems in general, i.e., leakage, seal life, environmental compatability, etc. These matters are state-of-the-art problems.