ML20032B081
| ML20032B081 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 10/28/1981 |
| From: | Spears H K GENERAL ELECTRIC CO. |
| To: | Hartman C CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| REF-PT21-81-509-000 PT21-81-509, PT21-81-509-000, NUDOCS 8111040370 | |
| Download: ML20032B081 (2) | |
Text
h GENER AL h ELECTRIC
'" " * ' " ' " ^ "
M ARINE STEAh GENERAL ELECTRIC COMPANY,1100 WESTEPN AVENUE, LYNN, MASS. 01910 TURBlNE DIVISION
- T,,g October 28, 1981
=0 [s' ff d
00 Mr. C.J. Hartman Plant Superintendent
~
$ g' /
Big Rock Point Nuclear Plant S
o Route 3, Box 591 Charlevoix, Michigan 49720
SUBJECT:
Notification of Possible Inicial Pressure Regulator Bellows Failure.
Persuant to Nuclear Regulatory Agency Reporting Requirements 10 C.F.R.,
Part 21
REFERENCE:
Turbtno Number 133637
Dear Mr. Ilartman:
This will confirm a phole call at approximately 11:00am EST on October 27, 1981 be+. ween Mr. Robert Schroder of your company and Mr. H. Sponrs, Product Safety Repressutative l
of the Medium Steam Turbine Department of the General Electric l
Company.
You are being advised in accordance witt; t.h e l
reporting requirements of the Nuclear Regulatory Agency 10 C.F.R.,
Part 21 that there is a possibility of a failure of the steam bellows within the reference steam turbine initini pressure regulator.
The effect of a failure, should it take place, would be to close the turbine main control valves.
While this modo is undoubtedly " fail safe" in terms l
of the turbine, it would tend to cause a rise in the turbine inlet pressure and,' depending on your mode of operation, a possjble rise in reactor steam outlet pressure.
While we have no way of knowing the effect, if any, on the reactor we are forced to consider the possibility that the initia3 pressure regulator might be construed by the Nuclear Regulatory Commission as a portion of the reactor control system.
We are therefore bringing this to your attention.
The bellows on your turbine had previously failed in 1977 and was replaced by a new bellows assembly with a different and better material.
Quite recently there have been three (3)
Ocokh3 PDR Y
C o /o
r G EN ER A L (@ E LECTRIC TO:
Mr. Ilartman October 28, 1981 failures of the new bellows.
The failures have bee'.1 in the form of a fracture of the weld at the inner diameter of one of the bellows convolutions.
The effect of the failure is to allow steam to vent through the opening in the bellows over and the drop in pressure on the bellows tends to close he turbine inlet valves.
The Department, design engineers ead our laboratory are working closely with the vendor of these bellows to determine the failure mode and establish a reliable replacement for the bellows assembly.
You will, of course, be advised as soon as we have further information.
d 4t m W
Howard C.K. Spears, Manager Power Systems Engineering Product Safety Representative Bldg. 4G4G2 Phone (617) 594-414G cc:
Director, Office of Inspection and Enforceme$ti U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Robert Schroder
' Big Rock Point Nuclear Plant Route 3, Box 591 Charlevoix, Michigan 49720 i
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