ML20207G397

PNO-77-196:on 771102,during Testing of Facility Crds,Seal Purge Flow from CRD Hydraulic Sys Pressurized 1-A Recirculation Pump Number One Seal Cavity to 1450 Psig, Potential Violation of Safety Limit,In Technical Sense

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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. i JP.ELIMINARY NOTIFICATIO

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November 8, 1977 i PRELIMINARY NOTIFICATI0il 0F EVENT OR

-- Pfl0-77-196 E6SSIBLE safety or public interest ce of an event significan of The information

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presented is as initially received without v Facility: .

or evalua. tion a e.

Docket Number 50-237 Commonwealth .2 Edison Com \

e Morris,. Illinois 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 ystem cavity to 145 pressurized psig. The reactor was shutoown with the vessel headngoff, progress with the reactor core partially loaded was in and refueli ,

the 1-A recirculation pump suction, discharge .

During this occurrence, i all closed as a result of a recent maintenance activity, a the licensee suspected that the 1-A pump through leakage from the number one seal cavity bowl At that time had been i t

pressurized, On November 4, 1977, the licensee conducted a press Es 1-A recirculation pump bowl and confirmed that the puuriz ~'

pressurized to 1450 psig at the time of the incidVnt on N The prim mp bowl had been ovember 2, 1977.

however,ary system safety limit is 1375 psig (including sta the 1-Athe overpressurization pump suction, discharge was andlimited bypass tovalves thempiping between syste  !

During a telephone conference call on November 7 t

1977, the licensee stated that the localized hydro of the 1-A recirculation pu pipfng occurring on November 2, 1977, was less and than the p bowl

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!

Thedecision.

their licensee will submit a written report,e identifying y significance.

basis for th 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 ,

i e ermination. N;kU Continued 9903120065 771100 h-7 96 PDR G =

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s. Page 2 3 . ^

Continued '

PN0-77-196

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November 8, 1977 An RIII inspector was dispatched to the site. _

safety limit of 1375 psig with fuelonsinimpose 'thea reactor Press o# releases by the licensee and RIII will not be issued Illinois has been informed. .

The State the Dresden Station at 8:30 p.m.RIII (Chicago) p one from received on Movember 2,1977.

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 (ForDistribution) 3 Transmitted: j L. V. Gossick, EDOMNBB /d.Rf ~ P Bldg //// d i E. G. Case, NRR E. Volgenau S. H. Hanatter, EDO J. J. Fouchard, PA Region g IE/d 16, [

SS Bldg //.*/3 1 W. G. ficDonald, MIPC (MAIL '

R. G. Ryan, OSP C. V. Smith, NMSS H. K. Shapar, ELD R'~T)McTiernan, CIA }

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R. Minogue SD

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