ML18081B097
| ML18081B097 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 01/31/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Schneider F Public Service Enterprise Group |
| References | |
| NUDOCS 8002250146 | |
| Download: ML18081B097 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION.
REGION I 631 PARK AVENUE KING OF PRUSSIA, PENNSYLVANIA 19406 JAN 3 1 1980 Public Service Electric and Gas Company ATTN:
Mr. F. W. Schneider
- Vice Pres1dent - Production 80 Park Place Newark, New Jersey 07101 Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter. It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions. If you have questions rega~ding this matter, please contact this office.
Enclosures:
Sincerely,
- ~~
~
Boyce H. Grier r
Director
- 1.
IE Information Notice No. 80-03
- 2.
List of Recently Issued IE Information Notices CONTACT:
D. L. Caphton (215-337-5339) cc w/encl s:
F. P. Librizzi, General Manager - Electric Production E. N.. Schwalje, Manager - Quality Assurance R. L. Mittl, General Manager - Licensing and Environment H. J. Midura, Manager - Salem Generating Station 8 0 0 2 2 5 0 '""
-~
~~
~- -,----
ENCLOSURE 1
- UNITED STATES NUCLEAR REGULATORY.COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 SSINS No.:
6870 Accession No.:
7912190666
.IE Information Notice No. 80-03
- oate: January 31, 1980 Page l of 1
.. Description of Circumstances:
On* September 6, 1979, wh1le' perform-ing a routine startup of* the Trojan Nuclear Plant, a speed control problem was encountered during warmup of the General
. Electric turbine and increase of t.urbine speed to normal operating speed (1800 RPM).
Techniciali}s were notified and trouble shooting in accordance with the technical manual was commenced to resolve the apparent oscillation between
. the primary and backup *speed control circuits which was hindering normal turbine startup operations. The technical manual indicates that it is permis-sible to remove either the primary or backup low value gate circuits which contain speed and acceleration error amplifiers.
Upon removal of the primary low value* gate circuit card, the backup card amplifiers, coming from a saturated condition; became the controlling circuit. During the shift in control circuits (primary to backup), the speed/acceleration error signal went to maximum which resulted in a full open signal to the turbine control valves.
Under existing plant conditions this appeared to the safety injection system as a major steam break downstream of the main steam isolation valves which re*sulted in a safety injection system actuation and reactor trip.
The Electrohydraulic Control System (EHC) techn.ical manual indicated that slight load changes are likely when a low value gate card is removed.
The effect on an unloaded turbine appears to be much more significant and tests conducted by Trojan personnel indicate that the transient is initiated whether the turbine is at a set speed or in an acceleration mode to a set speed.
Discussions with General Electric personnel by the licensee have been initiated in an attempt to verify the phenomenon observed and, if applicable, alert other facilities which operate a turbine with a MK 1 EHC System regarding the potential operation of the control valves when trouble shooting the speed
.control unit in-accordance with existing instructions.
This information is provided as an early notification of a possible significant matter. It is expected that recipients will review the information for possible applicability to their faci 1 it i es.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
- GEK Instruction Book 11381-D, 11Speed Control Unit 11, Maintenance Section, Page
- 4.
ENCLOSURE 2 IE Information Notice No. 80-03 Date:
January 31, 1980 Page l of 1
. RECENTLY ISSUED IE INFORMATION NOTICES
- .Information..
Subject Notice No.*
Date Issued Issued to 79-28 79-29 79-30 79-31 79-32 79-33 79-34 79-35 79-36
. 79-37 80-01 80-02
. Overloading of. Str.uctura l Elements Due.to Pipe Support Loads 11/16/79 All Power Reactor Faci-1 iti.es with an Operating
- License {OL) or Construction Permit (CP).
- Lo*ss of Nonsaf ety Related Reactor :Coo*l ant System In-strumentat ion During Operation 11/19/79 All Power Reactor Faci-lities with an OL or CP Reporting of Defects and 12/6/79 All. Power Reactor Faci-Noncompliances, 10 CFR lities with an OL Part 21
- or CP *
- Ose of Incorrect Amplified 12/13/79 All Power Reactor Faci-Response Spectra (ARS)
- Iinproper Closure of Pri*mary 12/21/79 All Power Reactor Faci-Containment.Access Hatches lities with an OL or CP In.adequate Des.ign of Safety-12/31/79 All Power Reactor Faci-Related Heat Exchangers
. i2/31/79 All Power Reactor Faci-and Essential Equipment lities with an OL or CP Computer Code Defect in 12/31/79 All Power Reactor Faci-Stress Analysis of Piping lities with an OL or CP
- .Elbow Cracki rig in Low. Press*sure 12/31/79 All Power Reactor Faci*
Turbine Discs lities with an OL or CP Fuel Handling E~ents 1/4/80 All Power Reactor Faci-lities with an OL or CP 8X8R Water Rod Lower 1/25/80