ML19210B240
| ML19210B240 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/18/1973 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7911040189 | |
| Download: ML19210B240 (1) | |
Text
DTSTRIBUTION:
PDR 4
Local PDR 4 Docket File PWR-4 Rdg File RCDeYoung SEP 18 B73 JHendrie ASchwencer Docket No. 50-289 RWKlecker AKenneke OGC Metropolitan Edison Company R0 (3)
ATTN:
Mr. John G. Miller RMBernero Vice President EGoulbourne P. O. Box 542 TR BCs Reading, Pennsylvania ACRS (16)
TIppolito Gentlemen:
Our attention has been drawn to the design basis you have used to size ove.cload protection (overload heaters) for the motor operators of safaty-related valves. We understand that the overload heaters are designed to act on 120-125% of the design, full load motor current, as specified by the manufacturer.
In view of the number of overcurrent trips which have been reported, we have concluded that such a low rating for the overcurrent protection might unnecessarily prevent a safety-related valve from functioning in an accident situation. We consider either of the following criteria acceptable for these overload heaters:
1.
Use cot:ventional size (125%) for preoperational testing, and replace with 300% rated overload heaters before initial criticality, or 2.
Use conventionally sized heaters for preoperational and periodic testing, with the overload heaters bypassed when a reactor protection signal exists, i.e., under accident conditions.
Please notify us within thirty (30) days of your intended course of action in this matter.
Sincerely, Originat olynod by R. C. DeYoung R. C. DeYoung, Assistant Director for Pressurized Water Reactors Directorate of Licensing ec: Mr. Gerald Charnoff 1585 060 Shaw, Pittman, Potts
& Trowbridge 910 - lica street, n. w.
omcE > Washington..DJ..C..20006 L.:.ADPL _,,,,L;Q(I,q,Q,,,
x7548/L:PWR-4 L:PWR-4y RB,er.n_egpfr,_,,
ASchw.encer R..,,
ung,,, dffy tr,c>_
$URNAME,
9/17/7 9/J.7 /73 9/j_73 7((f[73 orrE >
Form AEC.)ls (Rev. 9-53) AECM 0240 e.o ess-to-si4as-s 6.srs 7911040/M9 d.