ML20031G588
| ML20031G588 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/19/1981 |
| From: | JERSEY CENTRAL POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20031G580 | List: |
| References | |
| NUDOCS 8110230310 | |
| Download: ML20031G588 (10) | |
Text
r-Intake Components Intake components are all equipment necessary for the proper functioning of the intake as described in the Oyster Creek Final Environmental Statement (AEC, 1974) including ice control tunnel, trash bars, dilution pumps, and travelling l water screens and troughs.
1 Isocod Borers See definition of marine borer.
Key Species Key species are identical to important species as defined in the USNRC Reg.
Guide 4.2.
I Key Species of Fin and Shellfish Summer flounder, winter flounder, Atlantic menhaden, Altantic silverside, bay anchovy, bluefish, weaktish, striped bass, northern pipefish, northern kingfish, northern puffer, blue crab and sand shrimp.
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Plant Waste Discharge Line The plant waste discharge line Transports waste water from certain plant systems such as radwaste, sewage, and reactor building service water to the discharge l
canal.
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l Potential Damage By the use of wooden test panels and a semi quantitative assessment of the actual damage done to them by woodborers, an estimate of the damage to an actual wooden structure of si.Lilar characterist'es (treated or untreated) that is near the test panel location.
Pump Failure or intake Component Failure PtJmp or Intake Component failure Is Considered to
- ) Cessation of pump or intake component operation due to actual mechanical failure or 2) the cessation of pump or intake component operation due to operator action because of the I
anticipation of a mechanical failure.
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Thermal Plume The thermal plume is the portion of the discharge canal, Oyster Creek, and Barnegat Bay with teinperature elevated.8"C (1.5'F) over ambient due to the flow from the Oyster Creek Nuclear Generating Station.
Trr.ited Wood See the definition for creoseted panels.
Untreated Wood Wood, usually used for piling or bulkheading in the marine environment, that has not been chemically processed or treated to resist woodborer attack.
A Unusually Low Intake Canal Water Level The intake canal water level normally varies between 0.6 feet above or below sea level. Under unusual meteorological conditions the intake canal water level could drop substt:ntially so as to prevent proper operation of the dilution i
pumps.
Weekly I
Weekly is once during each calendar week at intervals of 7 days, plus or minus two days.
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Specification 1.
When the temperature i n Oyster Creek exceeds 30.6*C (87.0*F), as measured 1.2m (4.0 tt) be1ow the surface during mean tide at the U.S. Route 9 bridge over Oyster Creek, one dilution pump shall be put into operation.
If, after one dilution pump has been in operation for at least two hours, and the temperature easured at such point continues to exceed 30.6*C (87.0*F), a second dilution pump shall be put into operation.
2.
When the c.mbient water temperature is less than 15.6*C (60.0*F), two dilution pumps shall be put into operation.
3.
The station's third dilution pump shall be held in reserve and shall be put into operation within 15 (fif teen) minutes of such time as an insufficient number of dilution pumps are operable to comply with 2.1.4.1 and 2.1.4.2.
4.
Conditions may occur in which an insuf ficient number of dilution pumps are available to meet the intent of this specification despite the operation of the reserve pump. The station may be operated under these circumstances for a period not to exceed 14 (fourteen) days in order to make necessary repairs.
If after 14 (fourteen) days a suf ficient number of pumps are still unavailable, 3
corrective action shall be taken within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to bring the plant into I
compliance with this specification unless an emergency need for power conditico exists.
If the cerrective action taken involves reduction of unit power output, power shall be reduced as necessary to achieve the same ef fect as operating the proper number of dilution pumps required in order to meet the intent of this specification, i
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5.
Conditions may occur in which there is insufficient water level in the intake canal to support simultaneous operation of the stations circulating water system and dilution pumps. Should such a condition occur when the temperature in Oyster Creek measured at the U.S. Route 9 bridge exceeds 30.6*C (87.0*F) the station may operate with only one dilution pump for the period of unusually low water.
Should the ambient water temperature be less than 15.6*C (60.0*F) the station may operate without one or both of the dilution pumps for the porlod of unusually low intake canal water level.
Monitoring Requirements The temperature from the sensors located just upstream of the U.S. Route 9 bridge spanning the discharge canal shall be recorded and alarmed during Station operation. The discharge canal temperature shall be measured approximately 1.2 meters (4.0 ft) below the water surface at mean low tide. Redundant sensors in this location shall be employed to protect against loss of a sensor. The range of this instrumentation shalI be at least -6.7 to 48.9*C (20.0-120.0*F) and posses an overalI system accuracy of
.55*C (
1.0*F).
This instrumentation shall be subjected to a channel check weekly and calibrated monthly.
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in the event that the temperature monitoring system is inoperative during Station operation, discharge canal temperatures (at approximately the same location and depth) shall be monitored (1) once every eight hours during power l-level changes c; less than 25% or (2) once every four hours during power level changes of greater than 25% or pumping changes. This monitoring shalI utilize local reading Instrumentation and shall be performed until the temperature i
monitoring system is returned to service.
Bases The Final Environmental Statement of the OCGS Identifies the above dilution pump i
operating procedure necessary for the protection of aquatic biota.
These procedures have two purposes: reduce to an absolute minimum the amount of time that 30.6*C (87.0*F) is exceeded in the discharge canal and reduce the attraction of the discharge canal to overwintering of Atlantic menhaden.
Studies at 0 CGS Indicate (1) the potential for fish avoidance of the discharge canal at temperatures above 30.6*C (87.0*F) and (2) the lack of substantial observed avoidance by some fishes (menhaden, spot and blue crab) up to 34.4*C (94.0*F).
Operation of the dilution pumps in the abcVe manner will assure the minimum time period for potential fish avoidance of the discharge canal.
During periods when the temperature in Oyster Creek measured at the U. S. Route 9 bridge exceeds 30.6*C (57.0*F) and there is low water level in the intake canal, the operation of a single dilution pump will serve to reduce the potential fish avoidance. As soon as the water level at the intake structure returns to normal two dilution pumps will be put into operation.
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Studies of Atlantic estuaries indicate that young Atlantic menhaden's of f shore movements are correlated with autumnal water temperatures of 15*C (59'F).
Initiation of maximum dilution pumping at 15.6*C (60.0*F) will assure the least delay in the migration. Continued operation of the two pumps during the winter will reduce the area of attraction and thereby minimize a build-up in the fish standing stock in the discharge canal.
During periods when the ambient water temperature is less than 15.6*C (60.0*F) and there is low water in the intake canal, based on past experiences termination of a two pump operation should not cause an immediate environmental impact.
This should avoid cold shock mortalities associated with a potential station shutdown due to insufficient circulating water.
2.1.5 Rate of Change of Discharge Canal Temperature During Winter Shutdown Objective To minimize thermal stress to the aquatic environment due to sudden changes in water temperature during winter shutdowns.
Specification _
In the event of a controlled reactor shutdown with intake canal water temperature below 10.0*C (50.0*F), the two operating dilution pumps shall be turned of f when the first circulating pump is turned off or upon reaching 707. of full rated power, whichever comes first.
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SAFETY EVALUATION OYSTER CREEK NUCLEAR GENERATING STATION REQUEST FOR AMENDMENT TO PROVIS10NAL OPERATING LICENSE 140. DPR-16 TECHNICAL SPECIFICATION CHANGE REQUEST Pursuant to 10CFR 50.59 Jersey Central Power & Light Company has performed a safety evaluation of the Technical Specification Change Request No. 94.
This change request concerns only the Oyster Creek Environmental Technical Specifications (OCETS) or Appendix B to the Provistoaal Operating License.
The evaluation concluded that there are no unreviewed safety questions associated with the proposed changes to the OCETS.
The change will allow the dilution pumps to be operated such that during low intake canal water level the Plant can maintain power output. Af ter careful review of the proposed change, it has been determined as a result of this change:
a) the probability of occurrence or the consequence of an accident or malfunction of equipment important to safety previousiv evaluated in the safety analysis report will not increase, b) the possibility for an accident or malfunction of a different type than any evaluated previously in the safety analysis report will not be created, and c) the margin of safety as defined in the basis for any technical specification wIII not be reduced.
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SAFETY EVALUATION
SUMMARY
SHEET
- 1.
Change / Test / Experiment
Subject:
Proposed changes to the OCETS, or Appendix B to Provisional Operating License No. DPR-16. Technical Specification Change Request No. 94.
2.
Personnel Responsible for Safety Evaluation:
Mitchell Gertz 3.
System (s), Subsystems, Conponents Affected:
Dilution Pumps, intake Components 4.
Present the Conclusion of the Safety Evaluation:
No effect on safety 5.
Technical Specification Affected:
OCETS 1.0, 2.1.4 6.
FDSAR Sections Affected None 7.
a) What Plant Procedures were reviewed in this Evaluation?
Dilution pump operation b) What changes, if any, to these procedures are recommended?**
During low intake canal water level with a U.S. Route 9 bridge temperature over 87'F a single dilution pump is operated. When the ambient water temperature is less than 60*F one or both dilution pumps can be terminated until the canal water level returns to normal.
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Recommendations / Conditions:
None 9.
Comments ***
None Safety Evaluation Submitted By %.0/jev
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Date: February 27, 1981
- This is to be attached to Safety Evaluation
- Plant responsible for developing procedure changes
- Comments of other reviewers should be included here 1
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Notary Page 2.
Letter to Mayor of Lacey Township 3.
Certificate of Service I