ML19322C327
| ML19322C327 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/30/1978 |
| From: | Klinger G, Nolan F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| TASK-TF, TASK-TMR PNO-78-068, PNO-78-68, NUDOCS 8001160854 | |
| Download: ML19322C327 (1) | |
Text
d fx,.PRELIMINARYNOTIFICATION
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March 30, 1978 00 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-78-68 0J This preliminary notificatior constitutes EARLY notice of an event of POSSIBLE safety or public interest significance.
The information presented is as initially received without verification or evaluation and is basically all that is known by IE staff on this date.
g Facility:
Metropolitan Edison Company (DN 50-320)
MAE 33,d78 Three Mile Island Nuclear Station, Unit 2 Middletown, Pennsylvania M
PIATL Q.h A7T
Subject:
REACTOR TRIP AND SUBSEQUENT BLOWDOWN WITH SAFETY INJECTION ACTUATION A reactor trip occurred at 2:30 p.m., oniMarch.29,1978,' during Engineered Safeguard System testing following initial criticality on March 28.
The cause of the trip was determined to be the loss of a vital bus.
Loss of the vital bus resulted in a loss of power to Electromatic Relief Valve, which fails open on a power loss.
The opening of this relief valve resulted in a depressurization of the primary system.
As the pressure decreased to 1600 psi, all safety injection pumps operated.
Operation of the safety injection system resulted in post accident Sodium Hydroxide (NaOH) being injected into the primary system.
Preliminary analysis indicates that no limits were exceeded because of this event.
Primary concern at this point is to clean up the Na0H in the primary system.
Cleanup by ion exchanger and feed and bleed is in 1
progress and may take from 2 to 7 days.
The licensee is considering several design changes as a result of this occurrence.
Region I is sending an inspector to the site to review this event.
Media interest is not expected.
The Commonwealth of Pennsylvania has been informed. A press release is not planned by the licensee or NRC.
NRC, Region I, (Philadelphia) received notification of this occurrence by telephone from the Unit Superintendent at 9:45 p.m., on March 30, 1978.
Contact:
GKlingler, IE x28019 FNolan, IE x28019 Distribution:
Transmitted H St 3l6 O Chairman Hendrie Commissioner Bradford Commissioner Kennedy S. J. Chilk, SECY C. C. Kammerer, CA Commissioner Gilinsky (For Distribution)
TranrN tted:
MN88 T f3 P Bldg T.D'7 E. Volgenau IE L. '.'. Gos s i c k, EDO E. G. Case, NRR Region 5 3l/ V S. H. Hanauer, E00 J. J. Fouchard, PA SS' Bldg 7' (L (MAIL)
R. Hartfield, MIPC C. V. Sniith, NMSS T. J. McTiernan, 01A R. G. Ryan, OSP R. Minogue, SD H. K. Shapar, ELD PRELIMINARY NOTIFICATION 8001160hh f