ML20080Q135

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Ro:On 830831,reactor & Turbine Manually Tripped Due to Large Impingement Episode,Clogging Travelling Screens.Detailed Explanation,In Util 830914 Rept to State of MD Ofc of Environ Programs,Encl
ML20080Q135
Person / Time
Site: Calvert Cliffs Constellation icon.png
Issue date: 09/23/1983
From: Bauereis E
BALTIMORE GAS & ELECTRIC CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8310120262
Download: ML20080Q135 (8)
v • d • e


Text

g BALTIMORE GAS AND ELECTRIC CHARLES CENTER . P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING DEPARTMENT September 23, 1983 Region 1 USNRC 631 Park Avenue King of Prussia, PA 19h06

Dear Sirs:

According to Appendix B-Part II to Facility Operating License Nos. DPR-53 and DPR-69 Calvert Cliffs Nuclear Power Plant, the Environ-mental Protection Plan Section 4.1 unusual fish kills are to be reported.

Also according to Regulatory Guide 10.1 Appendix A. No. 181 Nonroutine Environmental Operating Report requires notification within thirty days of the event.

On August 31, 1983 Calvert Cliffs Nuclear Power Plant Unit 1 reactor and turbine were manually tripped due to a large impingement episode which clogged travelling screens. A more detailed explanation is given in the attached report to Maryland Office of Environmental Programs.

If you have any questions regarding this report, please call me at 301/234-6533 Sincerely, e

~

AL Eliza eth I. Bauereis, Pn.D l Senior Biologist EIB/few Attachment l cc: Document Control Desk 98r 888e a 88= s S PDR /

/l}

~. September 14, 1983 T0: Mr. John Veil Office of Environmental Programs FROM: Elizabeth I. Bauereis

SUBJECT:

I=pingement Episode at'Calvert Cliffs Nuclear Power Flant August 31, 1983 According to the NPDES permit (MD0002399) for Calvert Cliffs nuclear Power Plant under I Special Conditions, H. Intake Monitoring, any-impingement episodes substantial enough to cause modification to plant operations is a reportable event. At o a.m. on August 31, 1983

-CCNPP Unit 1 reactor and turbine were manually tripped, due to a massive influx of stressed and dying fish clogging the travelling screens. The

-fish involved were-primarily six to eight inch croaker, Micropogon undulatus and some spot Leiostomus xanthurus. The screen wash was not effective in removing the fish and nine fifty gallon drums of fish were removed from Unit 1 waterboxes.

The cause of the distress in the croaker was anoxia. Dissolved oxygen records in' the intake embayment show oxygen values of three mg/1.

or less 10 p.m. on August 30, 1983 until noon on August 31, 1983 Pro-longed periods of low dissolved oxygen are indicative of a rather wide--

spread ' phenomenon, i.e. , extending beyond the intake embayment.

Four curtain' wall panels were removed from the intake curtain wall in June. This allows egress for fish when the dissolved oxygen. in the embay-ment is lower than outside the curtain vall. In order for fish to follow a dissolved oxygen ' gradient to outside the curtain wall, a gradient must exist.

We have evidence from earlier studies (1977 and 1978) that the low dissolved oxygen conditions may extend from bottom to surface of the Bay and for a considerable distance above and below the plant. It would appear that a similar condition has occurred particularly since stratification was observed

'in late May and it has been an unusually hot summer.

Efforts are being mcde on a long term basis to improve both the screen-wash and the operation of the travelling screens. Also if low dis-solved oxygen values ( < 3 mg/1. ) are observed before 11 p.m. or for six hours then travelling screens should be rotated' continuously and the screen wash increased if possible.

h4 4 Senior Biologist Environmental Studies & Monitoring EIB/few

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, THE ACADEMY OFNATURAL SCIENCES OF PHHADELPHIA BENEDICT ESTUARINE RESEARCH LADORATORY BENEDICT, M ARYLAND 20612

  • TELEPHONE (301) 274 3134

' ?~ m:di ? "

September 12, 1983 Dr. Elizabeth Bauereis Baltimore Gas and Electric Co.

P. O. Box 1475, Room 920 Baltimore, MD 21203

Dear Bette:

On 31 August at 11:45 a.m. Jack Lodge called to inform me that Unit 1 at Calvert Cliffs had shut down at 6:00 a.m. that -

morning due to the impingement of a large number of dead fish.

At 12:45 p.m. Bill Yates and I began a series of observations at the plant. Many dead fish were on the bottom below the out-fall of Unit 2 screen wash discharge, but no fish were coming [

out the pipe. Many dead fish were also in the area of the out- g fall of Unit 1 screen wash discharge, and many (~100/ min) were '

coming out the pipe. Most of these were croaker and spot, but dead flounder, hogchoker, and menhaden were also observed.

Beginning at 12:55 a series of dissolved oxygen (DO),

salinity, and temperature profiles was made. Below is a table detailing the results of these profiles, but in summary the DO was 3.0 mg/l or greater in nearly all locations and depths except below 30 ft where it was between 0.15 and 0.3 mg/1.

2

^

DO, Sal Temp Curtain Wall (outside) O Surface 5.0 mg/l 14.6 /oo 27.9 5' 4.6 14.5 27.5 10' 4.1 15.0 27.8 15' 3.5 15.0 27.4 20' 3.1 15.3 27.2 25' 3.2 15.0 27.2 30' O.25 20.6 ,

25.4

- 40' O.25 22.1 25.5 Curtain Wall (inside)

Surface 3.0 15.0 27.7 15' 3.2 15.0 27.4 4

30' 3.5 15.0 27.0 35' O.3 20.4 26.0 Discharge Terminus 3.2 15.0 30.7 Discharge (1 mi offshore) i Surface 6.0 14.7 27.8 35' 2.6 14.7 26.3 Intake (1 mi offshore)

Surface 4.8 14.2 27.5 35' 3.3 15.1 26.4 Intake (1 mi offshore) 40' . 0.15 15.0 26.8 t

t e,

3

~

On 7 September 5arge numbers of dead fish were again seen in the areas of both screen wash outfalls. Several thousand dead croaker.were also seen on the surface over a large area extending from about a mile north of the discharge to Flag Har-bor at Long Beach. A DO profile at the outside of the curtain wall in front of one of the openings gave the following results:

Depth D_O 10' 2.9 mg/l 15' 2.5 20' l.6 25' O.7 30' O.15 We will continue to monitor conditions at times we are on the Bay, but if there is anything additional that you want us to do or if you have questions concerning any of the enclosed informaton please let us know.

'ncerely, Geor Abbe GA:ja cc: M. Hirshfield

4 Large Impingement Ep sodes - CCNPP 4 September - 0000 - Unit 1 - DO = 1.0 ppm Croaker - 1640 Spot - 118 Hogchoker - 66 Crab - 58 Other - 22 4 September - 0200 - Unit 2 Total - 15 Fish 5 September - 0400 - Unit 2 Total - 14 Fish 5 September - 0600 - Unit 1 - DO = 1.4 ppm Croaker - 1955 Spot - 38 Hogchoker - 22 Crab - 9 Other - 83 6 September - 0800 - Unit 1 - DO = 2.1 ppm Croaker - 6250 Spot - 75 Hogchoker - 4 Crab - 8 Other - 214 l 6 September - 1000 - Unit 2 I Total < 25 Fish 12 September - 0100 - Unit 1 - DO = 1.0 ppm

( Croaker - 7980 live

! 480 dead

Spot - 33 Hogchoker - 22 i

Crabs - 10 Other - 323 12 September - 0300 - Unit 2 Croaker - 297 live 13 dead Other < 25 NOTE: Impingement counts on 30 and 31 August (both at night) and on 7 September (noon and 2 p.m.) were unexceptional.

__ _ _

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