ML18113A851

LER 79-003/03L-0 on 790122: Following Containment Entrance Equipment Hatch Escape Airlock,Outer Door Was Not Proven Sealed within 72-h from Initial Opening.Caused by Problems in Sealing Exterior Hatch

ML18113A851
Person / Time
Site:	Surry
Issue date:	02/15/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A849	List: ML18113A848 ML18113A850 ML18113A851
References
LER-79-003-03L-01, LER-79-3-3L-1, NUDOCS 7902220100
Download: ML18113A851 (2)

Text

U.S. NUCLEAR REGUL,HORY CQ.\,1MtSS10N

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I Following a containment entrance, the equipment hatch escape airlock outer door~was -i10t I proven sealed within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from the.initial OJ?ening.

This event i~ contrary to . .the I NRC staff interpretation of Appendix J of 10CFR50, r_e-quiring-*that airlock seals. be leak l L2J.2J tested within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of the initial opening. Since the. inner hatch proved to be CI:JJ ~ealed properly, this event had no effect on the health and safety of the general publig. I *J '3 f 7 3 g SYSTEM CODE CAUSE CAUSE CODE SUBCODE COMP. COMPONENT CODE SUBCOOE LS JD I@ L!J@ L!J@ IP IE jN IE IT IR I@ LU@ VALVE SUSCODE l2!@. 9 10 11 12 13 r,'.;'\ L:iVRO c-VENT YEAR \.:..:.J ?.:;:ORT I 7 I 9 j ~U,,,BER 21 22 l=J 23 EFFECT SHUTDOWN SEQUENTIAL REPORT NO. ol ol 31 24 26 ACTION ;:uTURE TAKEN ,.CTION ON PU.NT METrlOD HOURS 18 OCCURRENCE CODE lo 13 27 28 29 19 RE?ORT TYPE. L1J 30 . ::o t:;;;\ ATTACHMENT NPR0-4 FORM SUS. PRIME COMP. SUPPUER R!:VISICN NO. lLJ 32 COMPONENT MANUF,\CTUR!:R 80 SUBMITTED 1° I L!.l@* 40 41 l!J@~@ UJ@ L£J@) I o Io Io .:3 34 35 36 37 W(§ 42 .LU@ j CI 3 j l I OJ@ CAUSE OESCRIPTlON AND CORRECTIVE ACTIONS @ !The delay in successful leak rate testing the equipment hatch escape airlock outer door L.J2...i . 4:l 44 47 QI] 1 was due to problems in sealing the exterior hatch. Adjustments were made to the roller l assewbly of the exterior hatch and the leak rate test was performed satisfactorily cm -1 within four hours after the expiration time limit. I. QTI] LI-----------------------------:--------:--------------'*

80 METHOD OF DISCOVERY DISCOVERY DES~IPTTON

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.., *(A~tachment, page 1 of 1) Surry Power Station, Un' 2 Docket No: 050-0281 Report No: 79-03/03L-0 Event Date: 1-22-79 Equipm.ent Hatch Leak Test Not Conducted

1. Description of Event: Following a containment entrance, the equipment hatch escape airlock-outer door was not proven sealed within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from the initial opening. This event is contrary to the NRC staff interpretation of Appendix J of 10CFR50, requiring that the airlock seals be leak tested within 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />s--0--f.

the initial opening. Since the inner hatch proved to be sealed properly, this event had no:effect on the health and safety of the general public. 2. Probable Consequences of Event: Delay of the equipment hatch escape airlock outer door leak test had DO effect upon the health or safety of the general public because containment integrity was maintained by the interior hatch. 3. Cause of Event: Required adjustments to the exterior hatch resulted in a delay of successful testing of the exterior hatch. 4. Immediate Corrective Action: Adjustments were made to the roller assembly of the exterior hatch and the leak rate test was performed satisfactorily within four hours after the expiration time limit. 5. Scheduled Corrective Action: None 6. Action Taken to Prevent Recurrence:

None necessary.

7. Generic Implications:

None