ML20207G397
| ML20207G397 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 11/08/1977 |
| From: | Klingler G, Nolan F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-196, NUDOCS 9903120065 | |
| Download: ML20207G397 (2) | |
Text
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JP.ELIMINARY NOTIFICATIO
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November 8, 1977 PRELIMINARY NOTIFICATI0il 0F EVENT OR i
-- Pfl0-77-196 E6SSIBLE safety or public interest significan ce of an event of presented is as initially received without v The information
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or evalua. tion Facility:
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Docket Number 50-237 Commonwealth Edison Com
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.2 Morris,. Illinois e
Jubject:
OVERPRESSURIZATION OF RECIRCULAT Commonwealth Edison Company reported to RIII (Chic 1977, during the testing of the Dresden Unit Ho at on November 2,'
(CRD's), the seal purge flow from the CRD hydraulic s2 the 1-A recirculation pump number one seal cavity to 145 ystem pressurized reactor was shutoown with the vessel head off, and refueli psig. The progress with the reactor core partially loaded the 1-A recirculation pump suction, discharge During this occurrence, i
ng was in all closed as a result of a recent maintenance activity, a the licensee suspected that the 1-A pump bowl had bee At that time i
through leakage from the number one seal cavity t
pressurized, On November 4, 1977, the licensee conducted a press 1-A recirculation pump bowl and confirmed that the puuriz pressurized to 1450 psig at the time of the incidVnt on N
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Es mp bowl had been The prim ovember 2, 1977.
however,ary system safety limit is 1375 psig (including sta the overpressurization was limited to the piping syste the 1-A pump suction, discharge and bypass valves m between During a telephone conference call on November 7 t
stated that the localized hydro of the 1-A recirculation pu 1977, the licensee pipfng occurring on November 2, 1977, was less than the p bowl and tion hydro conducted at 15 hydro up to this pressure.75 psig.
The piping code allows localizedr g nal constr pressurization of the 1-A recirculation pump has no safetA The licensee will submit a written report, identifying th y significance.
their decision.
e basis for o
for being a violation of a safety limit at least s a potential and the licensee's report will be considered in this d t echnical sense, V
e ermination.
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Continued 9903120065 771100 h-7 96 PDR G =
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3 Continued
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PN0-77-196 November 8, 1977
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An RIII inspector was dispatched to the site.
safety limit of 1375 psig with fuel in 'the reacto ons impose a Press releases by the licensee and RIII will not be issued o# Illinois has been informed.
The State the Dresden Station at 8:30 p.m.RIII (Chicago) received on Movember 2,1977.
p one from
Contact:
GKlingler, IE x28019 FNolan, IE x28019 Distribution:
'Ciiairman Hendrie Transmitted H St /d
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Commissioner Kennedy Commissioner Bradford Commissioner Gilinsky S. J. Chilk, SECY C. C. Kammerer, CA Transmitted:
(ForDistribution) 3 L. V. Gossick, EDOMNBB /d.RfP Bldg //// d j
S. H. Hanatter, EDO E. G. Case, NRR E. Volgenau
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i J. J. Fouchard, PA Region g IE/d 16, W. G. ficDonald, MIPC SS Bldg //.*/3 (MAIL R. G. Ryan, OSP C. V. Smith, NMSS R'~T)McTiernan, CIA
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7 H. K. Shapar, ELD R. Minogue SD 4
! ins PRELIMINARY NOTIFICATION E
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