ML19220C084
| ML19220C084 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/31/1978 |
| From: | Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19220C080 | List: |
| References | |
| NUDOCS 7904280191 | |
| Download: ML19220C084 (1) | |
Text
'
Sent facsimilie 3/31/73 g
%b
- p "%,%
uNiTso sTATss NUCLEAR REGULATORY COMMISSICN r* '
[ }7,. g' j
,,, p/
A)t
^
ascies i
/
y m PAR K AVENUE y
j g+ty[j
,UNG OF PRU$$1 A PENN5YLVAM A 1HH s.....
March 31, 1973 Docket No. 50-320 MEMORANDUM FOR:
K. V. Seyfrit, A/D Technical Programs, ROI, IE:HQ h E. C. McCabe, Jr., Acting Chief, RC&NS 3 ranch, RI THRU:
FROM:
D. M. Sternberg, Acting Chief, RP Sec; ion No. 1, RO&NS Branch, RI
SUBJECT:
THREE MILE ISLAND 2
, PRESSURIZER RELIEF VALVE CONTRCL (AITS#F146772)
SYSTEM 1.
PN-NRC:I-40 dated March 30, 1978, reported a reactor trip and blow-down at Three Mile Island 2.
The cause of the trip was the loss of a vital bus caused by an inverter failure.
The cause of the inverter failure is under investigation by the licensee.
The blowdown, however, was caused by the pressurizer Electromatic relief valve opening upon a loss of electrical power to its control bistable.
2.
This relief valve does not appear to be a safety-related component and it opens on a 1 of I logic-power arrangement producing a loss of coolant condition.
3.
It is requested that the adequacy of the design accroach (i.e.,
valve failing open on loss of control power) be reviewed on an expedited F isis for B&W facilities in general and Three Mile Island in particular.
S CNu.N w
Daniel M. Sternberg, Act're.'g Chief Reactor Projects Section No. 1 CONTACT:
D. M. Sternberg, RI (488-1256) i a
?
80 L'J 7 90455T[W
.