ML20245J665
| ML20245J665 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/31/1988 |
| From: | NORTHEAST UTILITIES SERVICE CO. |
| To: | |
| Shared Package | |
| ML20245J664 | List: |
| References | |
| NUDOCS 8905040216 | |
| Download: ML20245J665 (8) | |
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" Annual Environmental Protection Plan Operating Report
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_ - January 1 .Decernber 31,~ 1988 t.
e Millstone Unit 3 Environmental Protection' Plan prepared by Northeast Utilitics Service Company P.O. Box 270 Hartford, Conuccticut 06141-0270 April 1989
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i Annual Environmental Protection Plan Operating Report - 1988 l 1
- 1. Introduction This report covers the period January 1 - December. 31, 1988. During 1988, Unit 3 completed a 15 week refueling outage in mid-February; it also shut l'
down for about 3 weeks in April to repair Reactor Coolant System valves, )
- for 1 veek in October in response to a reactor trip during a Main Steam Isolation Valve test, and for about 3 weeks in October-November for MSIV
-repair. For most of the remainder of 1988, Unit 3 was at nominal full power of about 1150 MWe, operating at an annual capacity factor of 75.7%
(overall second-cycle capacity. factor through 1988 was 85.4%)..
As required by Millstone Unit 3 EPP, this Annual Environmental Protection Plan Operating Report (AEPPOR) includes:
- 1) summaries and analyses of the results of environmental protection activities,
- 2) a list of EPP noncompliance,
- 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 vinter 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 1988, Monitoring the Marine Environment of Long Island Sound at Millstone Nuclear Power Station, Waterford, Connecticut - Annual Report, 1988, presents .
results from studies performed during 3-unit operation, and I compaces them to those from 2-unit operation. The added cooling water flow for Unit 3 affects lupingement and entrainment, causes sediment scouring near the MNPS discharges, and alters the '
characteristics of the thermal effluent plume. The biological effects of these changes are discusred in the above-named report (Attachment 1).
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l 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 discharge points within the plant, 11cluding outfalls of each unit to the effluent quarry, and outfall of the quarry to Long Island Sound. Paragraph 11 of the permit requires a monthly report of this monitoring to the Commissioner of Environmental 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 Table la.
During 1988,~10 NPDES exceptions were reported from discharges associated with Unit 3 (Table Ib). The two violations for metals involved excessive iron in discharges from Unit 3 Condenser Hotvell,in January. Average concentration did not exceed permit limits (3.0 mg/1), but two of the daily grab samples, on the 18th and 25th, were 6.5 and 10.0 mg/l (above the maximum concentration limit of 5.0 mg/1).
Two other NPDES violations occurred in January; on the 23rd, a sample from the discharge of Units 2 and 3 non-contaminated floor drains was analyzed to have a pH value of 9.62 (NPDES limit 9.0).
Investigation did not reveal a cause; no process in~the drain collection area that could potentially raise the pH vas identified. The problem did not recur in 1988. There was also a hydrazine violation on January 30; this is discussed in a following section.
l The Total Residual Chlorine (TRC) sample taken from the quarry cut )
on April 27 was analyzed at 0.15 mg/l (NPDES limit 0.10 mg/1); !
this was reported as an exception, although it is possible that the value represents analytical error.' Each unit has procedures in place to ensure that chlorination of circulating water (to control microfouling) vill not exceed permit limits, and Units 1 and 3 had not chlorinated for several days prior to the 27th.
Unit 2 did chlorinate on the day of the violation, but had completed the operation by 0945. The sample in question was i collected at 1300, more than five hours later; however, the }
residence time of the quarry is calculated to be 30-45 minutes. ;
A violation of Free Available Chlorine (FAC) concentration acco: red at the Service Water discharge on November 5; the reported value (0.35 mg/1) exceeded the maximum permitted value (0.25 mg/1). The cause vas determined to be a temporary reduction in Service Vater flov, without a corresponding decrease in h/pochlorite injection rate. Corrective measures have been taken to prevent a recurrence.
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The final four reported NPDES violations, i.e., excessive quantities of boric acid discharged-from Units 2 and 3 non-contaminated floor drains in April and May,' vere later at<ributed to interferences in the analytical procedure.
Subsequent testing indicated that the potentiometric titration method used could yield' erroneously high values for boron, if interfering substances (e.g., calcium and magnesium salts) were present (see Attachment 2); a possible source of such substances might be leaching from recently poured concrete.
Sampling'for bydrazine (N 7Hg), biological oxygen demand (BOD), and chemical oxygen demand (COD) is required only when discharging vastevater containing hydrazine. The major hydrazine discharges at Unit 3 are releases following vet lay-up of steam generators; during 1988, these occurred only in January, after the 15 week refueling outage. Hydrazine concentrations, determined while draining the four steam generators, ranged from 46.6-137.3 mg/l (avg. 83.7). One discharge, on January 26, exceeded the
-administrative target of 125 ppm, but all were below the NPDES permit level of 200 mg/1. During the same discharges, BOD ranged from 11.7-13.5 mg/l (avg. 12.9) and C0D ranged from 41-114 mg/l (avg. 71).
Smaller volumes of hydrazine are released from auxiliary boiler blevdown; during 1988, this occurred only in January. On January 30, one sample had a hydrazine concentration of 87.0 mg/1, above the NPDES permit limit fcr this discharge point (75.0 mg/1).
However, the average for the month (four samples) was 58.9 mg/1, and the maximum hydrazine concentration, diluted in the circulating water flow, was 0.005 mg/l (NPDES limit 0.1 mg/1).
- 3. Environmental Protection Plan Noncompliance During 1988, no EPP noncompliance were identified for Unit 3.
4.- Environmentally Significant Changes to Station Design or Operation During 1988, 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 1988. Of the 15 PDCRs initiated during 1988, 7 received POBC approval; none of these involved unreviewed environmental issues. An additional 9 PDCRs, that had been initiated in past years, received PORC approval in 1988; none of these involved unreviewed environmental issues, either.
Unit 3 has 126 System Operating Procedures; of these, 58 vere added or revised during 1988. In addition, many procedures were modified to reflect small changes, of insufficient magnitude to require the issuance of a new revision. However, each of these changes, as part of the review / approval process, included an environmental evaluation; none vere ,
determined to involve an unreviewed environmental impact.
- 5. Non-Routine Reports of Environmentally Significant Events During 1988, 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 impact. Of the 28 events that constituted reportable occurrences in 1988, none were determined to cause a significant environmental impact. .
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Table 1. Millstone Unit 3 NPDES Data Summary, Jan.1 - Dec. 31,1988'.
a).
discharge discharge discharge discharge avg max max settle. SWS flow range pli range temp. range temp. (avg) AT FAC TRC sohds FAC (10' gpm) (*F) (* F) (ppm) (ppm) (mg/l) (ppm)
(*F)
Jan. 182-486 7.64.4 32.541.2 36.7 0.4 <0.05 0.05 <0.05 0.23 Feb. 334-942 7.98.5 36.0-59.4 47.8 0.10 11.2 0.07 <0.05 0.20 M ar. 790-942 8.0-8.5 53.1-65.8 58.7 19.1 0.08 0.07 <0.05 0.20 A pr. 182-942 7.6-8.6 43.9-67.5 54.0 9.6 0.09 0.15 <0.05 0.20 Msy 298 573 7.9-8.2 46.046.7 62.0 10.7 < 0.05 < 0.05 < 0.05 0.12 June 790 942 7.84.3 70.5-81.0 75.4 17.9 < 0.05 <0.05 <n.05 0.15 July 942 942 7.4-8,5 75.7-85.8 81.1 17.2 "" 0.05 <0.05 - 0.05 0.15 Aug. 942-948 7.7-8.1 81.949.8 85.3 17.6 0.05 0.05 <0.05 0.20 Sep. 790-942 7.8-8.2 79.9-86.4 83.3 17.8 < 0.05 <0.05 < 0.05 0.10 Oct. 623 942 7.9-8.2 52.9 82.6 69.1 10.2 0.12 < 0.03 < 0.05 0.15 N ov. 486-796 , 8.08.2 50.9-77.5 68.9 16.4 <0.05 < 0.05 < 0.05 0.35 Dec. 334 790 l 8.0-8.3 42.3-74.8 63.0 17.7 < 0.05 <0.05 <0.05 0.20 b).
Set $ vsp' 2 2 borte el &
pH 2 ten.p. FAC TRC 5o4. Sat. BOD COD hydrume sad conduct hthium grease metals No. or nepoons 1 0 1 0 0 0 0 4 0 0 en yest 1 1 0 2 1
Parameters are measured at Unit 3 discharge (001C), except for TRC and setticable solids, which are measured at MNPS d%harge (quarry cuts; 001) and SWS FAC (service water system; 001C-5).
2 Sampling for BOD, COD, and hydrazinc required only when discharging wastewater containing hydrazine; data for these events are presented in the text.
3 Some pararneters are measured at more than one point within Unit 3 or only under certain operating conditions. Values represent number of NPDES exceptions for all discharge points.
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NCCTHEAST UTILITIES
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- - ~ ~ - re MNPS Unit 3 AEPPOR - 1988 i
lTJ %%C'~~ Attachment 2 LE g
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July 28, 1988
, MP-S-CH-88-733 TO: J. Richard Robertson Senior Chemist - Millstone -
FROM: Gregory L. D'Auria Analytical Chemist - Millstone t
(Millstone Ext. 4575)
SUBJECT:
Analysis of Samples from Yard Drainage System for Boron Content 4
1 As per you~ request, four (4) samples from the yard drainage system were
' I, analyzed for boron content by Inductively Coupled . Plasma (ICP). A two point I calibration curve (10 ppm, 1 ppm) with a control standard check (5 ppm) was used
, for the calibration. The correlation coefficient for the calibration curve was
_j 1.0000. The results of the analysis are listed below. Note that Boron content is expressed in terms of ppm Boric Acid.
Sample ID Boric Acid (ppm)
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A 0.17 2 0.013 B 0.11 ! 0.165 C 0.572 2 0.057 D Not Detected The sa ae samples were also analyzed for boron content by potentiometric titrathn. The objective of the second analysis was to determine if the samples contait ed an interfering substance C.at would cause the potentiometric analysis to proroce erroneous results. The possibility for matrixes effects on the ICP ,
analysis is considered to be minimal. Listed below are the results of the Potentiometric titration.
Sample ID Boric Acid (ppm)
A <0.572 B 0.744 C <0.572 D 99.02 Note: The samples were not treated to remove interfering substances as noted in ASTM (i.e., the samples were not boiled and EDTA was not ,
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_ Conclusion l
The result of 99.02 ppm for sample D (Potentiometric Titration) seems to indicate that an ' interfering substance is present and that treatment for removing the interference is necessary. It should be noted that earlier NPDES samples, done by potentiometric titration, are most likely in error, as these samples were not treated for removal of the interference. Future NPDES Boron samples should be done by I.C.P. or _ possibly by a modified potentiometric method, i.e., EDTA is
.' added to the samples and the samples are boiled. -
GLD:mo cc: J. J. Waters T. F. Burns D. Brown (NUSCo) i
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