ML20086H137

Telecopy AO 75-58:on 750904,reactor Water Conductivity & Ph Exceeded Tech Spec Limits.Cause Under Investigation.Max Cleanup of Reactor Initiated Via Letdown Flow.Conductivities Recovered to within Limits

ML20086H137
Person / Time
Site:	Peach Bottom
Issue date:	09/04/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-75-58, NUDOCS 8401130446
Download: ML20086H137 (2)

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. PHILADELPHIA ELECTRIC COMPANY v/

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Peach Botton Atomic Power Station j

. Delta, Pennsylvania 1731k September 4, 1975 i

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,Mr. Jases P.

O'Reilly, Director

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' Office of Inspection and Enforcement Region 1 t

States Nuclear Regulatory Connission King. of Prussia, Pennsylvania 19k06 Subject Abnornal occurrence Ph-Ecur notification

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l. C o n firm i n g.. R.

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Fleischcann's phone conversation with Mr. Valter Saunack,"

Region 1, United States Suelear Regulatory

• Commission on September k,,1975

Reference:

Licente Number DPR-56

~ Technic al. Spe c1T1 cation. 3eferen ce :-

3.6.B.3 Report No.:

50-276-75-58 Report Date:

September k, 1975 t

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Pr.cility:

Peach Botton Atonic-Power Station -

R.D.

1, Delta, Pennsylvania 17314 Identification of Occurrence:

a, Exceeding rea? tor" vater chemistry limits.--

Conditions Prior to Occurrence:

Unit 3 at about 55% power.

I Description.of Occurrence:

a, During return of the Reactor Water Cleanup Systen to service, reactor water conductivity and pH exceeded the t'echnical Specification li=its.

Later, during resin trap cleani=g on the_ sane syste=, conductivity limits' vere again exceeded.

Vent stack radiation. release increased about a factor of k and the main stack radiation release increased slightly.

Designation of Apparent Cause of Occurrence:

It appears that in both instances, desineralizer resin was introduced j

into the reactor vesfel via the remeter water cleanup return line.

The precise =echanism has not yet been identified *..

Analysis, of Occurrence:-

Condu,tivities peaked at 13 and 15sushos respectively and were returned 4

to.less.than.10,uthes within a few hours following each event.

The pH reached a low of about 4.7 and,'isl~ recovering towards the-11=1t of 5.6.

These.short term checiwtry upsets should have i

I minimal affect upon the fuel cladding and.other reactor internals.

The less than 25 of Technical Specificatior increased. radioactive release was limits.

Corrective Actions Reactor shutdown was begun in accordance with Technical Specification requirements.

Maximun cleanup of the reactor was initiated via let-down flow.

Conductivities were recovered within licits before shutdown could be acce=plished.

In accordance with the Technical Specifications, nffgas samples and reactor water samples were taken.

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l The offgas sample indicated-only a s11gnt increase in 313.

Reactor vater sa=ple indicated no nisadficant change in dose equivalent iodine.

8401130446 750904 PDR ADOCK 05000278 S

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[g,.1L(.(. Abnormal occurrence PL-Nour Notifiestion 50-278-75-58 3eactor water cleanup flow return to the reactor vessel vill not be

! reinstated until the investigation has-been completed.

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Very truly, ours,

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N W '. T. Ullrich. Superintendent Peach Botton Atomic Power. Station 8

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