ML19345G096
| ML19345G096 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 04/08/1976 |
| From: | Redeker S PACIFIC GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| RO-76-02, RO-76-03, RO-76-2, NUDOCS 8103020276 | |
| Download: ML19345G096 (4) | |
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LIC JSEE EVENT REPORT
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CONTROL BLOCK:l l
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AVE LCENSE NUVBER E
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,69 74 75 80 EVENT DESCRIPTION DE I purinc normal operation secondary containment required by the Technical Specifications l 7 89 80 g l III.B.8. was lost for several hours when temporary plugs were inadvertently pulled l
7 89 80
@ l out of two, two inch diameter holes which had been drilled in the refueling building l 7 89 80 59 l wall ac part of seismic modifications. Backup secondary containment is not available.l 7 89 80 gg l The holes were plucced. Inproved plugging procedures are inplemented. (76-2) l 7 89 80 pnut YO$E t
COVPONE NT CODE A
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VOLAfgW ME l El A l J l Xl XlX lX l X l Xl J
'Z l9 l9 l9 l l Y 'l 7 89 10 11 12 17 43 44 47 48 CAUSE DESCA;PTION gg l Procedure deficiency. The plugging procedure allcued part of the plug to extend from l 7 89 80 gg l the wall where it could be snaCged by men and equipment being lowered and raised l
7 89 80 QE l on the wall while drilline more holes.
l saCUTy METHOD OF STATUS
% POWE3 OTHER STATUS 0:5COVEnv DISCOVERY DESCR;pTON y
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10 12 13 44 45 46 80 ACTMTV CONTENT RELEASED OF RFLEASE l IIA l
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10 11 44 45 80 PERSONNEL ExPOSUAES NUVEER TvFE DESCA9 TON 1
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7 89 11 12 13 80 PERSONNEL INJUA:ES NUVeiR DE SCn-P T ON H lolol'31 I
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7 89 11 12 80 OFFSITE CONSEQUENCES 8I UA I
7 89 80 LOSS DA OAMAGE TO FACILRY T i pe OE sC R.ot cN 7 89 80 ADDITIONAL FACTCAS DE I H^
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Lil NSEE EVENT REPORT i
CONTROL GLOCK:l l
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AME LCENSE NUMBER vg Typg 0s I cl A lH l14 l B l 1l l0 l 0l-l 0 l 0l 0l Ol 0l-l0 l0 l l 4 l 1 l1l1l1l l0l1l 7 89 14 15 25 26 30 31 32 CATEGORY TYP DOCKET NUMBER EV REPOAT DATE O CON 7 l DlI l
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,69 74 75 80 EVENT DESCRIPTION gg l During normal operation cecondary containment required by the Technical Specifications l 7 89 80 gg lIII.B.8 was lost for several hours when a temporary plug was not installed in a two l
7 89 80 Q l inch diameter hole drilled in the refueling building vall as part of seismic modifi-l 7 89 80 3l l cations. Backun secondary containment is not available. The hole was plugged.
l 7 89 80 UE l y m event of thic nature-refer to (76-2).
Trainirc in contairr.ent conducted.(76-31 7 89 pnug 80 DE CODE COMPONENT CODE SUPPLE M
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[YJ 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION gg l Personnel error. Failure to follow written instruction to plug the hole shorthy l
7 89 80 M l after drilling it.
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F ACUT v METHOO OF STATUS
% POWER OTHEP STATUS DISCOVERY DISCOVEAY DESCRIPTON y
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7 89 60 LOSS OR DAMAGE TO FACILITY TO*E DE SC AIPT ON DE L9 I
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7 89 80 ADDITIONAL FACTORS
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l LICENSEE EVENT REPORT Supplemental Information Report number: 76-2 and 76-3 Report Date: April 8, 1976 Initial Report Date: April 5, 1976 Event Dates: April 2, 1976 (76-2)
April 5, 1976 (76-3)
Facility: Humboldt Bay Pover Plant Unit No. 3 Identification of Occurrence: Temporary loss of secondary containment Conditions Prior to Occurrences: Steady state power; construction in prorress on refueling ~ouilding seismic modifications.
Description of Occurrences: As part of the seismic modifications to the refueling building, numerous two inch diameter holes are being drilled through the building walls. This work began on February 20, 1976.
The purpose of these holes is to anchor additional building bracing.
Procedurally, these holes are plugged as soon as practical after being drilled and a refueling building leak rate test is performed after the days work is complete in accordance with Technical SpecificationsSection III.B.8.
Sometime between 0800 and 1600 April 2, two of the plugs were inadvertently pulled out, probably by a " sky climber,"'(a machine used to hoist men and equipment up the refueling building wall). The routine re-fueling building leak rate test was started at 1715 April 2 and indicated that the building inleakage was excessive, and containment was not established as required by the Technical SpecificationsSection III.B.8.
An immediate search was conducted, the unplugged holes discovered and replugged. A leak rate test was started at 2305 April 2 which verified that secondary containment had been re-established. Seco ndary ccntainment was not available within 10 minutes as required by the Technical Specifi-cationsSection III.B.10 from the time the plugs were pulled out until they were replaced (between 7 and 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br />).
A second similar incident occurred on April 5, 1976 except that when a hole was drilled the construction personnel inadvertently neglected to install the plug. As a result of this incident, secondary containment was not available as required for between 5 and 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />.
P00R ORIGINAL
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Designation of Apparent Cause The first occurrence resulted from procedural inadequacy which allowed the handle of theplug to stick out of the hole, thus making it possible for equipment and men moving up and down the valls to snag the p1ngs and pull them out.
Th'e second occurrence was caused by person'nel :rror in that the written procedure which requires plugging the holes ir=ediately after drilling them was not followed.
Corrective Action Corrective action taken included:
1.
Revising hole plugging procedures to require inserting the plugs far enough so that no part of the plug extends out of the hole to prevent snagging. In addition, all plugs have been checked and re-installed where required so that all plug handles are com-pletely inside of the holes.
2.
Increased refueling buildire leak testing requirements. Tests are now required at the middle and end of the shift when construction is in progress. Also, the tests are scheduled to ensure more rapid correction of deficiencies in the event any are discovered. Leak tests are now also required after any work has taken place in an area where plugs are installed even if the work did not involve drilling holes or installing plugs.
3 Construction personnel were further instructed in the importance of ensuring that plugs are installed when holes are drilled and ensuring that existing plugs are not pulled out.
P00R ORIGINAL
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