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 L 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 {7-77) -ICENSEE EVENT REPORT U.S. NUCLEAR REGULATORY COMMISSION e CONTROL Ei LOCK: ~I -~~--'----'---'--......jl G) 1 6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION} IV I A Is IP Is 1 1 JG)I o lo I -Io Io Io Io I o I -lo I o 101 41 11 11 11 1181 I I G) 7 8 9 LICENSEE COOE 14

• 1S LICENSE NUMBER

• 25 26 LICENSE TYPE JO 57 CAT 56 CON'T [ITQ 7 B L!:J© I o I s I o I o I o I 2 I s I o 101 *1 12 I 1 I 9 I 7 I s IG) Gi w Lo~~ ~.! G) 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 RE?OllT D'ATE oO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

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

[IT[] 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE [Z I ZI@ ~@ ~@ I SI u1 Pl 01 RI Tl@ t.E.J@ l£_]@ 7 8 9 10 11 12 13 iS 19 20 SEQUENTIAL OCCUR REN.CE RE?ORT @ L::R/RO CVENTYEAR REPORT NO. CODE TYPE REPORT I 7 j 8 / L=.l 10 j4 !9 I I/I 10 13 J l2:J L=J NUMBER 21 22 23 24 26 27 28 29 30 31 ACTION, FUTURE EFFECT SHUTDOWN {22) ATTACHMENT NPRD-4 FORM :;us. PRIME COMP . SUPPLIER REVISION NO. 32 COM?ONENT MANUFACTURER 80

• 1cKE1@f'zo1@

or~tl@ MrzT@ l O 100,os. % I SU,yll@ 33 34 35 36 3 7 40 41 LJ ~@ I I I 2 1 0 I 7 j@) CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @ 42 43 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 !JJJJ . ITEi will be inspected prior to unit startup. I 1 a g FACILITY STATUS % POWER OTHER STATUS METHOD OF A32 47 80 ~@ IO I O ! 0 l@I ___ NA ___ __ DISCOVERY DISCOVERY DESCRIPTION 1.::.:;J ~@)~1--'E_n'-'-'g~i_n_e_e_r_'s

__ o_b~s~e~r_v~a~t~i-*~o~n--'-------~

8 e 10 12 11 ACT1VITY CONTENT Q\ RELEASED OF RELEASE AMOUNT OF ACTIVITY '2_V l2:fil tu @ I z I@) I NA 1 a s 10 11 45 46 80 44 44 45 NA . _LOCATION OF RELEASE @ 80 ?ERSONNEL EXPOSURES f NUMBER Q TYPE DESCRIPTION 39 EI2J 10 10 10 !~@,__ _______________________

____. 7 8 9 11 12 13 PERSONNEL INJURIES ,;":;\ 80 0 NUMBER,. DESCRIPTION6 NA I lu lu l@.____ ________________________

---J 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY '4:)\ TYPE DESCRIPTION ITli] ~@ 80 NA 7 891 ~a------------------

0---0-9-0--~-u------------------a~o 1ssu:~~~;;CRIPTION@

7 9 1 ,I-, 3-, NRC USE ON Ly "' ~o._ _______ NA ______________ 11 11 11 1 11 11 r 7 8 9 10 68 69 BO ; T. L. Baucom NAME OF PREPARER------------------

(804) 357-3184 PHONE:-------------

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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 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.