ML19256C958
| ML19256C958 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/22/1979 |
| From: | Klingler G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-183, NUDOCS 7910150788 | |
| Download: ML19256C958 (2) | |
Text
PRELIMINARY NGTIFICATION June 22, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-183 This preliminary notification constitutes EARLY notice of event of POSSIBLE safety or public interest significance.
The information presented is as initially' received without verification or evaluation gnd is basically all that is known by IE staff on this date.
IT SHOULD BE SPECIFICALLY NOTIED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT Facility:
Rochester Gas and Electric Corporation R. E. Ginna Nuclear Power Plant, Unit 1 (DN 50-244)
Ontario, New York Subj ect:
POTENTIAL DESIGN DEFICIENCY - ESF RESET FEATURE As a result of a Region I inquiry based on a similar problem identified at Point Beach in Region III, the licensee informed Region I of the potential for a failure of individual Engineered Safety Feature reset switches to block automatic and/or manual actuation of ECCS Systems, Containment Spray System, and Containment Isolation Systems.
If the pushbutton reset switches for these functions fail in the reset (open) condition the potential exists for a subsequent valid signal being blocked and actuation of one or both trains of ESF systems not occurring.
Preliminary review indicates that upon switch failure automatic initiation of Safety Injection could be defeated; manual initiation capability appears unaffected. Further review indicated that both manual and automatic initiation of Containment Spray, Containment Isolation, and Containment Ventilation isolation would be disabled on such a switch failure, requiring the operator to either correct the failure or initiate the safeguards action on an in-dividual component basis.
The licensee is currently evaluating the system design and emergency procedures in order to determine the need for corrective action and ability to cope with such failures.
This PN is issued for information only.
No Region I action is anticipated other than followup during subsequent inspections.
Media interest is expected because of continued local interest in site activities.
The State of New York inas been informed.
A press release is not planned by the licensee or NRC.
CONTINUED 1447 355 79101507Nfj
Continued June 22, 1979 Page 2 PNO-79-183 hTC, Region I, (Philadelphia) was notified of this occurrence by telephone from the plant superintendent at 3:00 p.m. June 21, 1979 as a result of a Region I inquiry made.at 1:30 p.m. on the same date.
Contag:
GKlingler, IE x28019 FNolan, IE x28019 SEBryan, IE x28019 Distribution:
Transmitted H St ifCS Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinsky ACRS (For Distribution)
Transmitted: MNBB T2.'/C P. Bldg /S.*g V. Stello IE L. V. Gossick, EDO H. R. Denton, NRR Region
/*/O H. L. Ornstein, EDO R. C. DeYoung, NRR J. J. Fouchard, PA R. J. Mattson, NRR N. M. Haller, MPA R. S. Boyd, NRR (MAIL)
R. G. Ryan, OSP SS Bldgfj,g3' J. J. Cummings, OIA H. K. Shapar, ELD W. J. Dircks, NMSS R. Minogue, SD S. Levine, RES PRELIMINARY NOTIFICATION 1447 356
.