ML20042E835

Annual Environ Protection Plan Operating Rept for 1989.

ML20042E835
Person / Time
Site:	Millstone
Issue date:	12/31/1989
From:	NORTHEAST UTILITIES SERVICE CO.
To:
Shared Package
ML20042E834	List: ML20042E833 ML20042E835 ML20042E836
References
NUDOCS 9005030197
Download: ML20042E835 (6)

Text

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Annual Environmental Protection Plan Operating Report January 1 - December 31,1989 ,

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Millstone Unit 3 Environmental Protection Plan r

l prepared by Northeast Utilities Service Company P.O. Box 270 Ilartford, Connecticut 06141-0270

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April 1990 i

9005030197 900427

• l l PDR ADOCK 03000423 R PDC l

. a Annual Environmental Protection Plan Report - 1989 ,

1. Introduction s i This report covers the period January 1 - December 31,1989. During 1989, Unit 3 finished its second operational cycle in May, and completed a 12 week refueling outage in July. The Unit was shut down for 2 weeks'in mid February to repair a -

hotleg loop isolation valve leak, and for 2 weeks in late November early December to replace a pressurizer code safety valve. For most of the remainder of 1989, Unit 3 was at nominal full power of about 1150 MWe, operating at an annual capacity factor of 69.9% (overall third cycle capacity factor from July through December.

1989 was 88.2%).

As required by Millstone Unit 3 EPP, this Annual Emironmental Protection Plan Operating Report (AEPPOR) includes:

1) summaries and analyses of the results of emironmental protection activities,

2) a list of EPP noncompliances,

3) a list of all changes in station design or operation which involved a potentially significant unreviewed environmental question, and

4) a list of non-routine reports, describing events that could result in

• significant environmental impact.

2. Environmental Protection Activities 2.1 Annual NPDES Report of Ecological Monitoring-(EPP Section 4.2)

Paragraph 5 of the referenced NPDES permit requires continuation of biological studies of MNPS supplying and receiving waters, entrainment studies, and intake impingement monitoring. These studies include analyses of intertidal and subtidal benthic communities, finfish communities, entrained -

plankton, lobster populations, and winter flounder populations. Paragraph

! 13 of the permit -requires an annual report of these studies .to the -

Commissioner of Environmental Protection. The report that fulfills these requirements for 1989, Monitoring the Marine Environment of Long Island l Sound at Millstone Nuclear Power Station. Waterford. Connecticut - Annual Report. 1989, presents results from studies performed during 3-unit operation, and compares then to those from 2-unit operation. The added cooling water flow for Unit 3 affects impingement and entrainment, causes sediment scouring near the MNPS discharges, and alters the characteristics-of thermal effluent plume. The biological effects of .these changes are discussed in the above named report (Attachment 1).

2.2 Effluent Water Quality Monitoring Paragraph 6 of the referenced NPDES. permit requires monitoring and ,

recording of many water quality parameters at MNPS intakes and at 37 '

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discharge points within the plant, including outfalls of'each unit to the effluent quarry, and outfall of the quarry to I.ong Island Sound. Paragraph {

11 of the permit requires a monthly report. of this monitoring to the Commissioner of Environmemal Protection. The report that fulfills these requirements, Monthly Discharge Monitoring Report includes data from all three Millstone units. Those data that pertain to Unit 3 are summarized in 7 Table la.

During 1989, only one NPDES exception was rep..aed from a discharge associated with Unit 3 (Table Ib). In June, the monthly oil and grease  :

sample required at 001C-6 (Unit 3 Condensate Polisher Regeneration Wastewater Neutralization Tank Including System Floor Drains and . Hot i Water Heating System Drainage) was not taken.- This discharge normally comprises two batch releases per day, but as the Unit was shut down, no ,

flow occurred at the time of month when sampling .was to have been '

performed. Based on measured oil and grease values in May and July (<0.5 mg/1; mhximum permitted concentration 20.0 mg/l), there is no reason to expect that the June discharges contained excessive levels of oil and grease.

Sampling for hydrazine (N,H ), biological oxygen demand (BOD), and 4

chemical oxygen demand (COD). is required only when discharging wastewater containing hydrazine. The major hydrazine discharges at Unit 3 are releases following wet lay-up of steam generators; during 1989. these releases occurred in February, May, and' late June-early July. Hydrazine concentrations, determined while draining the four steam generators, ranged from <0.13.1 mg/l (ppm) in February, from 0.2-1.0 mg/l in May, and from 72110 mg/l in late June early July. All concentrations were below the NU administrative target of 125 mg/1, as well as the NPDES permit level of 200 l mg/1. During the same discharges, BOD ranged from 18-32 mg/l and COD l

ranged from 70-97 mg/l. Hydrazine sampling at the Unit 3 discharge to the effluent quarry was required during these releases; values ranged from <1-26 pg/l (ppb), well below the NPDES permit limit of 0.10 mg/l (100 ppb).

i Smaller volumes of hydrazine are released from auxiliary boiler blowdowns; ,

during 1989, these occurred only in July. Hydrazine concentrations'of these

, releases ranged from 0.4-53.7 mg/l (NPDES permit limit of 75 mg/l);  ;

concurrent concentrations in the effluent quarry were <:1 ppb. ]

During 1989, some additional hydrazine was released from a leak in the 'A' CCP heat exchanger. This release was sampled for hydrazine, BOD, and COD until it was repaired; hydrazine concentrations ranged from 7-41 mg/1, i

Wu BOD from 9 57 mg/1, and COD from 41-600 - mg/l. Concurrent concentrations in the effluent quarry ranged from <1-15 ppb. '

Also included in emironmental protection activities related to NPDES permitting during 1989 were two submittals to the Connecticut Department of Environmental- Protection. . The first, on March 14, was a request to modify the NPDES permit by adding two discharge points at Unit I to accommodate a Long Term Distillation Unit.' The second was the permit renewal application for Millstone (NPDES Permit CT0003263; EPA ID No.

CT000845198), submitted to the CT-DEP on December 1. Approval of the application and issuance of the renewed permit are expected in 1990.

3. Environmental Protection Plan Noncompliances During 1989, no EPP noncompliances were identified for Unit 3.

4. Emironmentally Significant Changes to Station Design or Operation During 1989, no Unit 3 Plant Design Change Records (PDCRs) met the acceptance criteria for inclusion in this report, i.e., required an environmental review and received Plant Operation Review Committee (PORC) approval for implementation in 1989. Of the 24 PDCRs initiated during 1989,16 received PORC approval; none of these involved unreviewed environmental issues. An additional 6 PDCRs, that had been initiated in past years, received PORC approval in 1989; none of these involved unreviewed emironmental issues either, r

Unit 3 has 133 System Operating Procedures; of these,65 were added or revised during 1989. In addition, many procedures were modified to reflect small changes,

of insufficient magnitude to require the issuance of a new revision. However, each of tr.ese changes, as part of the review / approval process, included an environmental evaluation; none were determined to involve an unreviewed environmental impact.

5. Non Routine Reports of Environmentally Significant Events i

During 1989, no events occurred at Unit 3 that met the acceptance criteria for inclusion in this report, i.e., required submittal of a Licensee Event Report-(LER) from Unit 3, and involved a situation that could result in a significant environmental l impact. Of the 35 events that constituted reportable occurrences in 1989, none were determined to cause a significant emironmental impact.

1 l Although not of sufficient magnitude to require issuance of an LER, three I environmentally related incidents occurred during 1989. Two events (on Feb 22 and i

May 6) involved auxilianj boiler fuel oil spills during tank filling. In both cases, the spillt were minor (<15 gal.), and were contained and cleaned up with on site -

material before they reached the yard drainage system. Applicable procedures are

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being reviewed to prevent recurrence of this problem. The third event (Jun 25) '

involved the accidental release of approximately 83 gal., of 12.5% sodium i hypochlorite solution (used for biofouling control). A contractor stepped on, and broke, some piping used for hypochlorite injection to the service water system. The  ;

leak was stopped by closing the hypochlorite tank outlet valve, but the spill reached Long Island Sound via floor / storm drains. About 25 dead fish were observed near the drain outfall immediately after the spill, and presumably caused by it. Follow-up sampling by NU Environmental Lab personnel found no additional fish mortality. ;

The storm drain outfall is near the Unit 3 Intake Structure, and the spill was entrained with, and diluted by, the approximately 334,000 gpm cooling water flow.-

All appropriate state and federal agencies were notified, as per 10 CFR 50.72 (b)(2)(vi); no significant environmental impact was determined.

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-t Table 1. Millstone Unit 3 NPDES Data Summary, Jan.1 Dec. 31,1989.

a). Selected water quality parameters for Unit 38, discharge discharge discharge discharge avg max max settle. SWS flow range pH range temp. range temp. (avg) AT FAC TRC solids FAC (10' gpm) ('F) ('F) ('F) (ppm) (ppm) (mgi) (ppm)

Jan. 790-942 6.9-8.4 48.7 63.7 - 58.1 17.8 0.08 < 0.05 <0.1 0.15 Feb. 486-948 8.18.6 363-63.1 49.0 10.0 0.05 0.08 <0.1- 0.21 Mar. 638-954 8.0-8.4 44.8-63.0 56.6 18.1 .1.05 <0.05 <0.1 0.18  ;

Apr. 486 948 8.1 8.5 41.2-65 3 57.7 14.8 v.05 < 0.05 <0.1 0.19 May 167 942 8.0-8.4 46.8-73.2 57.4 63 0.07 < 0.05 <0.1 0.17 June 319.790 8.1-8.4 53.4 64.2 59.0 0.1 < 0.05 0.12 <0.1 0.15 July 319 948 8.0-83 62.1 873 75.7 9.4 0.09 . < 0.05 <0.1 0.15 Aug. 7 % 948 7.6-8.2 77.4 92.8 86.6 19.0 0.08 0.05 <0.1 0.17 Sep. 790-942 7.47.7 79.0 90.9 85.2 17.9 0.08 <0.05 <0.1 0.09 Oct. 7 E 942 7.57.7 74.8-85.8 79.1 19.1 <0.05 < 0.05 <0.1 0.15- t Nov. 638 942 7.57.9 47.1-82.2 71.2 17.4 < 0.05 < 0.05 <0.1 0.20 i Dec. 638 942 7.4 7.9 39.6 693 55.2 15.0 <0.05 < 0.05 ' < 0.1 0.20 b). Number of NPDES exceptions during year. 2 kt. Susp. Boric oil & -

pH temp. FAC TRC Sol. Sol. BOD 3 CODI hydrazine 8

acid conduct. lithium grease' metals 0 0 0 0 0 0 0 0 0 0 0 0 1 0

' Parameters are measures at Unit 3 discharge (DSN 001C), except for TRC and settleable solids, which are

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j measured at MNPS discharge (quany cuts; DSN 001) and SWS FAC (service water system; DSN 001c.5).  ;

2 Some parameters are measured at more than one point within Unit 3 or'only under certain operating conditions. Values represent number of NDPES exceptions for all discharge points.

' Sampling for BOD, COD, and hydrazine is required only when discharging wastewater containing hydrazine; data for these events are presented in the text.

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