ML19289D337

LER 78-083/03L-1 on 780720:containment vessel-to-annulus Differential Pressure Exceeded Tech Spec Limit by 1 Inch. Purge of Containment Bldg Commenced.Caused by Inadequate Monitoring of Pressure Increase by Shift Check

ML19289D337
Person / Time
Site:	Davis Besse
Issue date:	08/15/1978
From:	Fulmer S TOLEDO EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19289D331	List: ML19289D330 ML19289D334 ML19289D335 ML19289D337
References
LER-78-083-03L, LER-78-83-3L, NUDOCS 7903050347
Download: ML19289D337 (1)

Text

NRC F ORM 3G6 (7 77)

LICENSEE EVENT REPORT (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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U@l of s l el _ l c l ,1 c l n6d l@l 63 017 l 2 l o I 7 l a l@l REPORT EVENT DATE 14 75 el 8 DATEl 11 S40l 7 l 8 j@

I 8 60 61 OOCKET a. Uvae R EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012 l l At 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br /> on 7/20/78, it was noted that containment vessel to annulus differential j l

10131 I pressure exceeded the TS 3.6.1.4 limit of +25 inches water gage by 1 inch water gage.

Ccatain- l 1047 hours0.0121 days <br />0.291 hours <br />0.00173 weeks <br />3.983835e-4 months <br /> on 7/20/78, the purge of the containment building commenced.

o 4 l At 1050 hours0.0122 days <br />0.292 hours <br />0.00174 weeks <br />3.99525e-4 months <br /> l l o l 3 l l ment vessel to annulus dif ferential pressure was within allowable limits at to the health and safety of the public or unit person g lo is l I on 7/20/78. There was no threat The slight increase above the TS limit would not cause containment vessel inter g g g l nel.

(NP-33-78-100) l g o ,3 , l nal pressure to exceed the design pressure if a LOCA had occurred. a0 7 8 9 COMP. VALVE SYSTEM CAUSE CAUSE SUSCODE SUSC00E CODE CODE SUBCODE COMPONENT CODE J

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EVENT YE AR 17 18 I l- 1018 3126 L<J l 28 i

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_ 21 22 FOR1 9. SU PP LI E MANUFACTURER HOURS 22 S S T D lAl@ lCl3l1l0l@

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42 43 44 47 33 J4 3b 26 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h The rate of in- l i o l The cause of this occurrence is both procedural and personnel error.

The to be adequately monitored by the shift check. l 11 I t j 1 crease of pressure was too great l commencement l

[i;7g l time span between preparation of the containment purge permit and actua l 3 l ] of the containment purce was excessive.

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l li 14 l l pressure has been added to the control room reading sheets. 80 7 8 9 ISCO RY

% POWER OTHER STATUS DISCOVERY ST 5099.

DESCRiPTio31 ST S Q l C)@ l 0 l 0 l 0 lgl NA j { gl Surveillance Test l ACTIVITY CO TENT LOCATION oF RELEASE AMOUNT oF ACTIVITY RELE ASED OF HELE ASE NA l M LZj @ l' Z gl NA l l

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I NA IP 101010 7 8 9 l@l 11 12 go LOSS OF OR DAVAGE TO FACILITY TYPE DESCRIPTION 80 7 8 9 10 "" "*' "'"

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. . . . .78-132 NAME OF PREPARER PHONE: