ML20059H900

NPDES Noncompliance Notification:On 900711 & 27,sewage Treatment Plant Effluent Sample Found Outside NPDES Permit Limit.Caused by Reduction in Flow,Resulting in Long Detention Times.Plant Corrected by Using Smaller Trains

ML20059H900
Person / Time
Site:	San Onofre
Issue date:	09/06/1990
From:	Nandy F SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9009190082
Download: ML20059H900 (4)

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Southern California Edison Company J

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23 PARKER STREET IRVINE, CALIFORNIA 92718

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~ F. R. NANDY TELEPHONE'

- MANAGER. NUCLE AR LICENSING '

(714) 597 6400 '

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. September 6, 1990' 1

q U. S. Nuclear Regulatory Commission Attention:. Document Control-Desk' l

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-Washington, D.C. 20555 a

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Subject:

- Docket No. 50 206

. Report of NPDES Permit Violation, Jul 1990; j

Sm Onofre Nuclear Generating Station, Unit 17 '

Reference:

Letter from H. W. Newton (SCE) to A212 CoeL(Califdrnia' Regional

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Water Quality Control

Board, San Diego Region),L" NPDES:

Monitoring Report" for Unit 1, dated August 29,1990-As required by Technical Specification (TS) 6.16.2.c, Provisional Operating License' DPR-13, enclosed is a copy of the referenced letter forwarding the July 1990 National Pollutant Discharge Elimination' System (NPDES) monitoring report' for Unit 1.-

The July Unit 1 NPDES monitoring report stated that:.'(1) on July 11,.thel Unit 1 -

sewage treatment plant effluent sample' pH of. 5.6 was outside the! NPDES permit -

limit of between 6-9 pH; and, (2) on July 27, the MESA sewage treatment plant

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effluent sample pH of S.5 was outside the NPDES permit limit of between _6_9 pH.

_ The remaining 8 water sources sampled during these occasions, however, were ~

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found to be within NPDES permit limits.

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Document Control Desk L 2

_ September 6, 1990 i,

There were no NPDES violations in Units 2 and 3 in July 1990. If you require any1 additional information, please let me know.

s V$ry truly yours,.

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.. j Enclosure j

1 J. B. Martin l(Regional Administrator, NRC Region V) 1 cc:

C. W. Caldwell (NRC Senior Resident Inspector,, Units 1,2 and 3)s j

J.- E. Tatum (NRR SONGS Project: Manager)-

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$ AN ONOPRE NUCLE AR GENER ATING ST ATION 4

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August 29, 1990~

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Mr. Arthur L..Coe,~ Acting Executive Officer y

. California Regional Water; Quality _ Control Board j9 San Diego Region 9771'Clairemont Mesa Boulevard,: Suite B 1

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San ~Diego, California' 92124-13311

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Subject:

NPDES Monitoring Report H

San Onofre Nuclear Generating Station, UnitJ1L The NPDES monitoring report for:SanLonofre Unit 1Lcovering thei month: of July is submitted in accordance with the 'requirementseof.,

CRWQCB Order 88-001 (NPDES Permit No.'CA0001228)'.. A summa'ryfof l

the generating unit's status andisignificant analytica1Tresults; is provided below.

The unit. continued its shutdown for refueling and:maintenancek All sampled. water' sources were found.to'be within: permit limits,L with the.following exceptions., The Unit 11 sewage treatmentiplant!

had low pH on' July.12, while'the Mesa. sewage treatment plantLhadL lot pH on July -27.

The Unit 1 pH depression-_in theLUnit 1 phut.

seems to be associated with the digester on the' south 1t' rain'.;;The-

. digester has been operating at low pH and.the supernatant l.

depresses the activated sludge'pHEand:the final effluentt A'

. combination of process-_ changes and chemical' treatment of.the-digester are being used.to,bringLthe 141 backLinto an acceptable range.

The Mesa plant ~pH'has!been corrected by using the. smaller process train.

The cause seemszto have been a reductioniin' flow,

'resulting;in long detention times and.pH reduction due'to-i,

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nitrification.

L Pursuant tol Order No.88-001, Reporting Requirement.12, the..

y" Efollowing representative iscauthorized-to. sign and: certify all

" reports required'by this order:

Arthur.Kneisel,~Environmentali Engineer.

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Mr. Arthur L. Coe August 29, 1990 1

.I certify uh3er penalty of. law'that I have personally examined and am familiar with the'information submitted in the attached document, and based on my inquiry of those individuals immediately responsible for obtaining the information, I believe the submitted information is true, accurate,.and' complete.

I-am:

aware that there are'significant penalties for submitting false information, including the-possibility of fine and imprisonment.

L Sincerely,-

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. W. Newton Manager, Site Support Services l

.l Enclosure cc:

Envitonmental Protection Agency, Region IX

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