ML19273B828
| ML19273B828 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 05/14/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7906180219 | |
| Download: ML19273B828 (1) | |
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UNITED STATES
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May 14, 1979 W
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a Docket Nos. 50-133 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 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 79-67AN.
Sincerely,
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Director
Enclosure:
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l PN0-79-67AN cc w/ enclosure:
W. Barr, PG&E W. Raymond, PG&E l
E. Weeks, PG&E, Humboldt Bay r
J. D. Worthington, PG&E R. Ramsay, PG&E, Diablo Canyon k
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IMMFDIATE PRELIMINARY NOTIFICATION May 14, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSDAL OCCURRENCE -- pNo-79-67AN (Correctea)
This preliminary notification constitutes sununary information of an event of safety or public interest significance.
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Facility: Three Mile Island Unit 2
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Subject:
NUCLEAR INCIDENT AT THREE MILE ISLAND p.?MA 7/
Q\\B, f5 3l Operational Status
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The average coolant temperature is being maintained at 170 ' degrees F by natural circulation.
Pressure is about 650 psi.
Steam is being admitted to the main condenser through the turbine bypass valves from the A Steam Generator. The highest incore temperature read-ing is 308 degrees F.
2.
All four trains of the independent, additional charcoal filter system are presently operable. Normally three trains are operating at any one time to provide addir.ional filtration for the entire gas-cous effluent flow from Unit 2.
Iodine concentrations in the gas-cous effluent have been below instantaneous release limita and below detectable levels most of the time.
3.
Preliminary hydrostatic testing of the existing decay heat removal system ("A" and "B" loops) has been performed.
Leaks have been identified and are being corrected.
4.
The pressurizer has been taken " solid" periodically to obtain con-firmatory information on pressurizer level and to check primary nystem Icak rate.
5.
Measurements of the liquid level inside containment is planned in the near future by measuring the hydrostatic head on the sump discharge piping using a recently installed Heise gage.
Environmental Status Environmental radiation levels continue to be consistent with natural back-3round levels. There were approximately four minor releases during the past week (May 7-13, 1979) associated with venting of the primary makeup tank and work on the new filter train system and monitors. During this period 14 24-hour continuous air samples and 27 air grab (1 to 2 hr.) samples were collected, and all were less than MDA.
A goat milk sample taken on May 8, 1979 contained an I-131 concentration of 12 pCi/ liter.
The latest goat milk sample collected and analyzed on May 13 showed less than MDA for I-131 (F10 pCi/1).
Grass samples taken at the goat farm showed I-131 levels less than MDA.
Cow milk samples and grass samples from other locations show less than MDA levels for I-131.
Ground surveys continued to show radiation to be at background levels.
Aerial surveillance flights have not shown any levels of I-13) above MDA. Other Federal Agencies have not reported any positive values for samples taken during this period.
IMMEDIATE PRELIMINARY NOTIFICATION LJL)f
{}[ ~}O CONTINUED U) ll ls 7906060178
I Continued May 14, 1979
,Page 2 PNO-79-67AN(Corrected)
Contact:
RCPaulus, IE x27246; DThompson, IE x28487 Distribution:
Transmitted H St i' Chairman Hendrie Connissioner Bradford S. J. Chilk, SECY Comissioner Kennedy Connissioner Ahearne C. C. Kammerer, CA Comissioner Gilinsky ACRS (For Distribution)
Transtaitted :
MNBB P. Bldg 9?l0 J. G. Davia, IE L. V. Cossick, EDO H. R. Denton,'NRR Region I 972P b'3 [
H. L. Ornstein, EDO R. C. DeYoung, NRR Region II *t Q6 J. J. Fouchard, PA R. J. Mattson, NRR Region III Sl' N. M. lialler, MPA V. Stello, NRR Region IV Ll'.. g.
-Ar R. G. Ryan, OSP R. S. Boyd, NRR Region V lj '. 4!5 H. K. Shapar, ELD SS Bldg $ Zd (MAIL)
W. J. Dircks, NMSS J. J. Cummings, OIA S. Levice, RES R. Minogue, SD IE (TMI) Site __
(Provide copy to STATE)
C. Abraham, PA (Middletown - TMI-Informat. ion Center)
White House Situation Room FDAA (Provide copies to the Administrator and the Operations Center)
EPA DOE /EOC PEMA BRP (State of PA)
DCPA HEW Handcarry (FAA)
IMMEDIATE PRELIMINARY NOTIFICATION 9
9