ML19263D870
| ML19263D870 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/09/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Johari Moore SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 7904130368 | |
| Download: ML19263D870 (1) | |
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UNITED STATES
/r 3.$0.(,tS NUCLEAR REGULATORY COMMISslON 3
REGION V G
SUITE 202, W ALNUT CRECK PLAZ A
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0 1990 N. C ALIFORNI A DOULEVARD 9
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W ALNUT CREEK, C ALIFOHNI A 94593 April 9,1979 H
Docket Nos. 50-206 b
50-361 50-362 Southern California Edison Company P. O. Box 800 2244 Walnut Grove Avenue Rosemead, California 91770 Attention: Mr. J. B. Moore Vice President Gentlemen:
In accordance with our letter dated April 1,1979 transmitting Bulletin 79-05, we arc enclosing Preliminary Notification 79-67P.
Sincerely,
' q.c2L R. H. Engelken Director Enclosure n:
PN0-79-67P cc w/ enclosure:
J. M. Curran, SCE J. T. Head, SCE 3
J. H. Drake, SCE
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7904130368 e
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IMMEDIATE PREllMINARY NOTIFICATION i
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Apell 9, 1979
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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--Ph0-79-67P*
p This preliminary notification constitutes surunary inforrstion of an event of saf ety or public interest significance, lhe information presented is a
_ summary of informat. ion as of 6:00 a.m. on 4/9/79.
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cf Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)
Subject:
NUCLEAR INCIDENT AT TilREE MILE ISLAND E
Plant Status v,-
Bulk coolant inlet and outlet temperatures are about 280 degrees F.
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average core thermocouple temperature is about 300 degrees F, and the highest thercocouple reading (811) is about 425 degrees F.
At approximately 0430 hours0.00498 days <br />0.119 hours <br />7.109788e-4 weeks <br />1.63615e-4 months <br />, April 9, the reactor coolant system pressure reached the 400 psig endpoint established for the second degassing evolu-tion.
At lower pressures in the 400 to 1,000 psig range, noise Monitoring indicated possible presence of some gas in loop B of the reactor cooling system.
Noise monitoring verified re solution of gas with time.
The operating reactor coolant pump vibration increased to 8.5-9 mils but the level of vibration was still significantly below the limit (30 mils).
Pressure variation for degassing is continuing.
Following reduction to 400 psig, the licenses plans to increase pressure to the 900-1,000 psig range and a phased cooldown is under consideration as the next step.
The licensee requested and received permission to temporarily change the minimum pressurizer level to 150" from 200" to prevent high pressurizer levels on pressure decreases, ws At approximately 1320 hours0.0153 days <br />0.367 hours <br />0.00218 weeks <br />5.0226e-4 months <br />, April 8, the reactor coolant system began to hert up.
This was due to a decrease in steam generator level.
Steam C.:nerator A level was increased to decrease the primary temperature.
Hydrogen concentration in containment is about 1.85%,
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At approximately 1942 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.38931e-4 months <br /> EST, the last airplane involved in the filter airlif t lef t Pasco, WA, for liarrisburg, PA.
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(The letter "0" was not used, previous issuance was PNO-79-67N)
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P Continued April 9,1979 Pane 2 CORRECTED _ COPY PNO-74-67P (E<
FNVIRONMENTAL STATUS w.
Offsite radiation levels identified by NRC survey teams continue to range between 0.01-0.1 mR/hr.
The results were obtained from routine surveys performed on the east and west side of the Susquehanna River at distances of up to 4 miles north and south of the sito.
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The following ARMS surveys were conducted during April 8,1979:
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MAXIMUM TIME RADIATION LEVELS LOCATION DISTANCE FROM SITE 00:00-00:30 1 mR/hr sector 180
- 1 mile
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(south) w 06:00-05:20 0.3 mR/hr sector 200 1 mile (west-southwest)
'l 09:00-09:50 0.03 mR/hr sector 170 1 mile f1 (south-southeast)
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18:05-18:30 0.05 mR/hr sector 275 3 miles (west-northwest) ec, Eight of fsite air samples collected near the NRC trailer during April 1-8 indicated iodine-131 concentrations between 0.9 - 3.3 picocuries per
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cubic meter (pCi/m ).
The maximua permissible concentration per 10 CFR 20 3
3 is 100 pCi/m.
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No new data were reported for milk, water, and vegetation samples.
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Offsite dose rates as determined by NRC thermoluminescent dosimeters (TLDs)
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indicate that present radiation levels are in close agreement with expected
. natural background levels.
Minor fluctuations among individual TL0s are expected due to the limitations of the TLD systen.
Forty seven TLDs are 27 presently positioned at various locations around the site.
a-Dose rates (47 locations) as measured by NRC thermoluscent dosimeters have
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ranged from 0.01 to 0.02 milliroentgens per hour for the past 24-hour periods of April 7 and 8.
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Continued April 9, 1979 Page 3 CORRECTED COPY PN0-79-67P
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Contact:
EJordan, IE x28180 NCMoseley, IE x28160 Distribution:
Transmitted H St Chaiman Hendrie Comissioner Bradford S. J. Chilk, SECY Comissioner Kennedy Commissioner Ahearne C. C. Karraerer, CA g;
Comissioner Gilinsky (For Distribution) l Transmitted:
HNBB /8/88 4 P. Bldg /d!0~Ap>/
J. G. Davis IE 4
6-L. V. Gossick, EDO H. R. Denton, NRR Region I /d//CM H. L. Ornstein, EDO R. C. DeYoung, NRR Region II #4X11 f 4
J. J. Fouchard, PA R. J. Mattson, NRR Region III/O;/5,p,g
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H. M. Italler, NPA V. Stello, NRR RegionIVfr/
Region V //) gaff R. G. Ryan, OSP R. S. Boyd3,NR3 f,2/,5fy i
H. K. Shapar, ELD SS Bldg 10,OVN1 (MAIL)
W. J. Dircks, NHSS J. J. Cumings, 01A S. Levine, RES R. Minogue, SD IE (THI) Site /d/07/7N (Provide copy to STATE)
White House Situation Room
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'3 DCPA i:-r HEW 3
PJhW Handcarry (FAA)
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ll?.EDIATE g -e PRELIMINARY NOTIFICATION lyl.f_,
CORRECTED COPY wir R:1_:
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