ML19241B265

Forwards PNO-79-67AV

ML19241B265
Person / Time
Site:	Humboldt Bay, Diablo Canyon
Issue date:	07/03/1979
From:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:	Crane P PACIFIC GAS & ELECTRIC CO.
References
NUDOCS 7907130384
Download: ML19241B265 (1)

Text

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UNITED STAT ES 8'7

• ?,g NUCLEAR REGULATORY COMMISSION T E a,-

.J REGION V 0, '

g 1990 N. CALIFORNI A GOULEVARD

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WALNUT CREEK, CALIFORNIA 94596 July 3,1979 Docket Nos. 50-133 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94105 Attention: Mr. Philip A. Crane, Jr.

Assistant General Counsel Gentlemen:

In accordance with our letter dated April 1,1979 transmitting Bulletin 79-05, we are enclosing Preliminary Notification 79-67AV.

Sincerely,

/hD 5cfk-R. H. Engelken Director

Enclosure:

PNO-79-67AV cc w/ enclosure:

W. Barr, PG&E W. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay J. D. Worthington, PG&E R. Ramsay, PG&E, Diablo Canyon 55b 341' 7907130%$$

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I I M DIATE PRELIMIMARY ff0TIFICATION July 2,1979 PRELIMIMARY N0YIFICATICH OF EVENT OR UMUSUAL OCCURRENCE -- PtW79-67-AV This orillainary notiffestion constitutos scu:narv information of 'nn event of safaty or ecolic in*,arsst cianh'icanco.

in4 inforn, scion _ orsuntad _1s a

tzsary of inforntion as of 7: 00 a.u. on coril, 1979.

Faility: These Mile Island Unit 2 liiddletown, Pennsylvania (CN 50-320)

Stbhet-UPDATED STATUS REPORT Cwriticul_:

1.

Average coolant teraturs is 162 degrees F.

The hiciast incor, therm-cocole tu e rature indication is 270 dagrees F.

Core flov is taing pro-vided by natural circulation.

Core cooling is being r.:aintaimd by Stmim; the "A" Stasa Generator to the cain condenser on the bypass valv5.

The incrensas in teratures over the past week ars due to delib* rata reduction of the cpaning of the bypass valve in order to increase the therdal driving hasd for natural circulation flow.

Prinary pressure is about 325 psi.

The licensee still plans to slowly decrease prwsure to about 250 psi.

2.

Daily.Muurwmnts of reactor building water lev 91 still indicata 7.0 i 0.5 feet above floor 1sval.

3.

Ths Prsssure/Volene Control system continues to progress toward ccepletton slowly.

Enviretwow:tal Status:

Environeental radf ation levels remain consistant with natural background levels.

Altbarne roleues remain wil below Technical Specification li alts.

Troe June 25-July 1,1973,19 air sakplas, 8 nilk samles, 4 vegetation saaples and 2 soil saeples were collectad by the NRC. All analytical results Vers luz than iBA. EPA air, water, and oilk sceples collected during the week (up to June 29) shewed no detectable activity f rcm TMI.

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