ML20046B869

NPDES Noncompliance 5 Day Rept Re Exceedance of Daily Max Limit for Total Residual Chlorine in Cooling Tower Blowdown Discharge to Delaware River.Caused by Rupture of Sodium Hypochlorite Injection Line.Injection Line Isolated

ML20046B869
Person / Time
Site:	Hope Creek
Issue date:	07/30/1993
From:	Thomson F Public Service Enterprise Group
To:	NEW JERSEY, STATE OF
References
NLR-E93228, NUDOCS 9308060351
Download: ML20046B869 (22)

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. O PSEG f Public Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038 Nuclear Depanment CERTIFIED MAIL JUL 3 01983 RETURN RECEIPT REQUESTED ,

ARTICLE NUMBER: P 346 404 646 NLR-E93228 Assistant Director of Enforcement Division of Water Resources NJ Department of Environmental Protection and Energy 401 East State Street I CN 029 Trenton, NJ 08625-0029 ,

Gentlemen:

HOPE CREEK GENERATING STATION NJPDES PERMIT NO. NJ0025411 5-DAY REPORT - CLAIM OF UPSET CASE NO. 93-07-25-0328-44 In accordance with NJAC 7:14A-3.10, Public Service Electric and Gas Company (PSE&G) is submitting this 5-day. report for the exceedance of the daily maximum permit limit for Total Residual -

Chlorine (TRC) in the Station's cooling tower blowdown discharge to the Delaware River, DSN 461A. PSE&G reported this exceedance ,

to the NJDEPE Hotline and was assigned Case No. 93-07-25-0328-44 by Operator 14. The following information was provided during  :

this call:

i. Description of the discharge: Sodium hypochlorite

- location: Hope Creek Generating Station Cooling tower blowdown

- concentration: >l mg/l TRC

- receiving water: Delaware River li. Duration of the discharge:

- Start: Unknown i

- Stop: July 25, 1993 3:05 a.m.

iii. Cause of the upset: Rupture of the sodium hypochlorite i injection line at the circulating water system hypochlorite tanks.

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'NJdEPE 2 JUL 3 01993  !

NLR-E93228 i

v iv. Steps taken to determine cause:

Conduct investigation, review ,

operating logs, interview personnel involved, i

v. Steps taken to eliminate discharge:

Hypochlorite injection line isolated immediately. >

vi. Steps being taken to reduce,  ;

eliminate and prevent reoccurrence:

Dependent upon investigation results. System will remain isolated until line is repaired.

Since the original call to the Hotline, PSE&G has reviewed the residual chlorine stripchart associated with the cooling tower i blowdown and determined that the discharge violation began at approximately 8:23 p.m. on July 24 and terminated shortly-before l 5:00 a.m. on July 25. The TRC concentrations for the period are -

estimated below. Final calculated TRC values shall be submitted {

with the July DMR. l TRC Concentration (ma/l) July 24 July 25 i

Daily Discharge 0.2 0.6 l Maximum Peak Observed 7.0 10.0  !

The Station's NJPDES permit (NJ0025411) limits TRC concentration in the cooling tower blowdown to a monthly average concentration l of 0.2 mg/l and a daily maximum concentration of 0.5 mg/1.- A  ;

copy of the stripchart is included for your information as Attachment 1. A second copy of the stripchart has been included i as Attachment 2 and has been annotated to include information on 1 time, TRC concentration and other events and comments associated with the incident. Based on the stripchart, operating logs, and i interviews with personnel involved, PSE&G has prepared a chronology of events (Attachment 3) which details the '

circumstances surrounding this incident. In support of this  ;

information', PSE&G is also submitting copies of relevant system  !

operating logs which provides the technician's description of the l incident (Attachment 4) and the results of TRC analyses performed during the period (Attachment 5).

The TRC violation was caused by a leaking flange gasket in the i sodium hypochlorite injection system used for the Station's circulating water system.. The leaking gasket allowed sodium '

, hypochlorite to drain from the storage tanks to the chemical  !

building floor drain which discharges to the 1C lift station i l

NJDEPE 3 JUL 3 01993 NLR-E93228 servicing the Station's Low Volume and Olly Waste (LV&OW) system.

This floor drain is also used for other low volume wastestreams, including a continuous chlorine analyzer, and must be left open to prevent water from flooding the room. The 1C lift station is designed to operate based on level controls and automatically transferred the chlorinated water through the LV&OW system to the cooling tower blowdown line. The oscillations on the stripchart are the result of the 1C lift station cycling on and off based on water level.

Chemistry Department personnel inspect the sodium hypochlorite injection system once per shift as part of the technician's routine rounds. Leaks or problems identified during these rounds are reported to supervisory personnel and prompt action is taken to prevent discharges of chlorine or other chemicals to the i environment. In this case, upon discovery of the leaking gasket, the technician immediately isolated the source of the leak and took actions to plug the floor drain. Please refer to the chronology of events (Attachment 3) for other actions taken by the technician to reduce effluent TRC concentrations and to notify supervisory and response personnel.

Discovery of the TRC violation was hampered due to a plannou electrical outage in the 13KV loop which services the chlorination and dechlorination systems as well as the remote (Chemistry Department) indication of effluent TRC concentrations. <

The chlorination and dechlorination systems had been taken out-of-service prior to the electrical outage. Even after discovery of the TRC spikes on the stripchart, the technician thought there was a problem with the analyzer because the chlorination system was not operating. It was during the cleaning and verification of the analyzer that the leak was identified.

On July 26, 1993, a work activity was issued to replace the leaking flange gasket (Attachment 6). The work was completed the following day and the line was retested and found to be satisfactory.

PSE&G believes and maintains that it acted in accordance with NJAC 7:14A-3.10 which requires notification of any violation of a daily maximum permit limit to the NJDEPE. PSE&G also believes that based upon the regulatory definition of " Upset" contained in NJAC 7:14-8.2, the requirements for claiming an " Upset" in NJAC 7:14A-3.10(h), and the attached documentation, that all requirements necessary to claim an affirmative defense have been satisfied and that no NJPDES permit violation occurred.

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, NJDEPE 4 JUL 3 01993 NLR-E93228 i

If you have any comments or questions on the information provided, please contact Mr. Patrick J. McCabe of my staff at (609) 339-1245.

Sincerely,  ;

J&V A

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'A.s) w F. X. Thomson, Jy.

Manager -

Licensing and Regulation ,

Attachments (6)

C Steve Mathis NJ Department of Environmental Protection and Energy -

Southern Bureau of Water and Hazardous Waste Enforcement Suite 301 South 20 East Clementon Road Gibbsboro, NJ 08026 .

Petty Officer Thomas Wiker U. S. Coast Guard 1 Washington Avenue Philadelphia, PA 19147-4395 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 H. K. Lathrop, USNRC Hope Creek Resident i

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ATTACHMENT 1 l

-4 COOLING TOWER BLOWDOWN  !

RESIDUAL CHLORINE STRIPCHART ,

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i ATTACHMENT 2 I COOLING TOWER BLOWDOWN ANNOTATED RESIDUAL CHIDRINE STRIPCHART {

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grab sample result of <0.05 mg/l TRC. .

19:10 Swingshift tech makes outside systems tour. Although CWS-chlorination system ,

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pump house. No unusual conditions i noted. He also inspects'the.

dechlorination chemical injection  :

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19:21 Swingshift tech inspects blowdown TRC analyzers and obtains grab sample.- Both ,

analyzers are running normally and agree )

with grab sample result of <0.05 mg/l I (analysis at 19:30). j b

19:48 Effluent analyzers show first' signs of TRC - 0.0015 mg/1.

i 20:15 Effluent analyzer reading 0.1 mg/l TRC.  ;

20:23 Effluent analyzer exceeds 0.5 mg/l'TRC. )

Reading peaks at 0.6 mg/l TRC. Spikes j intensify as TRC concentration'in LV&OW j comes to equilibrium.- Concentration oscillates as 1C. lift station pumps cycle:on and off. The cycles peak between 6 :and 10 mg/l as lift station l runs and drop tx) approx. 0.02 mg/l between pump runs..

21:35- 13 KV power supply returned to service.

Communication reestablished with remote monitor in Chemistry Department.

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F 21:45 Visual-only alarm of effluent TRC concentration in Chemistry Department.

23:15 Midshift tech begins his shift. He noticed effluent TRC alarm but knows CWS and SWS chlorination systems are shut down. He concluded false analyzer or computer reading due to power outage.

25 JUL 93 02:45 Midshift tech starts up ammonium bisulfite pumps during tour in preparation for startup of SWS chlorination system.

02:52 Midshift tech goes to blowdown effluent i sample house to sign chart and obtain j sample. He finds numerous spikes on stripchart. He can not explain source of spikes because chlorination systems ,

are shut down and dechlorination is operating. He flushes the analyzers of any accumulated debris.

03:02 Midshift tech obtains a grab sample of the effluent for TRC analysis. On the way to the lab, he stops at the CWS chlorination house to sign charts. Upon entering, he smells chlorine and finds hypochlorite leaking from the suction side of. injection pumps to the floor drain. He immediately goes to the tank isolation valves and isolates the source of the leak. r 03:15 Midshift tech calls the Senior Nuclear Shift Supervisor (SNSS) and Duty l Supervisor to ensure proper NJDEpE notifications are made and that Site '

Protection responds to chemical release. He then analyzes effluent sample with the results off-scale.

03:45 Midshift tech goes to ammonium bisulfite  ;

pump house, takes manual control of the l system and maximizes pump output (100%  :

stroke, 100% speed) He returns to the effluent TRC analyzers and watched meter  ;

drop from 2 mg/l to 0.5 mg/1. i i

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03:50 Midshift tech returns to ammonium bisulfite pump house and starts second bisulfite pump. Upon return to effluent analyzers, meter reading is <0.001 mg/1.

04:00 Midshift tech calls to SNSS with updated information and reports inside to provide estimate of volume lost from '

tank (estiraate 300 gallons) .

04:45 Midshift tech returns outside for system tour.

05:00 Midshift tech signs stripchart and obtains effluent grab sample. Analyzers are runr.ing normally and agree with grab sample result of <0.05 mg/l (analysis at 05:09).

05:40 Midshift tech signs stripchart. All readings at <0.05 mg/1.

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ATTACHMENT 5 CHI.ORINE ANALYSIS LOG i i

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A ATTACHMENT 6 WORK ORDER NO. 930726158 I

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SUMMARY

HC 1 HMD HMB ODDV-070 CIR WTR CHLOR PMP SUCT VLV FLNG LEAK FEG/ COMP ID: ODDV-070 MUC: F LOC: YARD SYSTEM: DD CIRC WTR HYPOCHLORINATION SERIAL NBR:

ACT

SUMMARY

ODDV-070 CIR WTR CHLOR PMP SUCT VLV FLNG LEAK ACT DESC-1: GASKET AT 3" WAFER BUTTERFLY VALVE ODDV-080 BLEW OUT, CAUSING SODIUM HYPOCHLORITE SPILL. REPLACE FLANGE GASKETS INSPECT ALL FLANGES TO ENSURE THEY ARE NOT DAMAGED. RECOMMENDED FLANGE TORQUE FOR 3" PVC IS 30 FT-LBS. USE NEW HYPALON GASKETS PRESTAGED. ~ . ._ n SECTION 2 -- PLANNING INFORMATION PI/MNER: FARR 3260 QAR SAFETY CLASS / SEISMIC EQ SUPERVISOR: SUTTON+ N QGC D N N DRf - -

DCRf - 00000 - PKG 00000 RC#: 0103 AUTH NO:

ACCT NO: E531040 WORK STANDARDS: PRG PLN: IQ0005 (HP W/STD): LOC: 1616 TEMPORARY MODIFICATION i 00 0000 PLN JOBf: 592333 PODE JOB PKG SECTION 3 -- SCHEDULING INFORMATION . . ..

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SCHED START DATE: 07/27/93 OVERDUE DATE: ESTIMATED $dNP'OWER ED LER f HANGINf0F E N8R DUR EST RCA SCHEDULER C @ @ $ UEST (,31M NTM 002 4.0 8.0 0.0

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• 000 0.0 0.0 0.0 000 0.0 0.0+ 0.0 000 0.0 0.0 0.0 j TOTAL BRS: 4.0 SECT - PERMISSION TO BEGIN S/S PERMISSION TO BEGIN WORK:

, ((M / DATE: TIMh::/M TAGGING REQUIRED: Y "

TAG /gg' tty SECTION 5 -- CLOSE OUT

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S/S SIGNOFF: / DATE:

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