ML20211K715

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Rev 4 to Station Procedure Sp 84.122.01, Intake Canal - Sediment Deposition Monitoring
ML20211K715
Person / Time
Site: Shoreham File:Long Island Lighting Company icon.png
Issue date: 09/08/1986
From:
LONG ISLAND LIGHTING CO.
To:
Shared Package
ML20211K713 List:
References
SP-84.122.01, NUDOCS 8612150058
Download: ML20211K715 (18)
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Text

. MC-1 SP Nuxbar 84.122.01 e Revision 4 P or D Apvl Level P Effective Date ffR-51ction Head 'N )h]I DAEfAM 8' .

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Signature or'f/A Dhts TPC No. Effective Expiration Date of TPC Date of TPC INTAKE CANAL - SEDIMENT DEPOSITION MONITORING 1.0 PURPOSE To provide a detailed instruction for station personnel to monitor the canal bottom condition to satisfy the requirements of Technical Specification 4.7.1.4.a.1.

2.0 RESPONSIBILITY The Operational Compliance Engineer shall be responsible for insuring the proper implementation of this procedure.

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3.0 DISCUSSION 3.1 The average sediment deposit in the canal is about 0.5 feet per year.

Measurement is required every 12 months and whenever there is a severe storm which could deposit more than one foot of sediment. In addition, the canal banks may fail under severe earthquake conditions and slide into the canal to partially block the flow. This procedure identifies the canal bottom condition and identifies a need for dredging or other remedial action wherever the bottom elevation limits shown in Section 9.0 are exceeded, to ensure that adequate cooling water to the plant is always available.

3.2 Parts of this procedure were written due to an NRC commitment. These commitments can be found in the SCAR listing and/or computer printout. '4 4.0 PRECAUTIONS 4.1 Steps for this plant procedure shall be performed in sequence.

4.2 The maximum bottom elevation differential between any two adjacent sample point should not exceed 4 feet.

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5.0 PREREQUISITES See attached forms SPF 84.122.01-1 and SPF 84.122.01-2 for applicable prerequisites.

6.0 LIMITATIONS AND ACTIONS This station procedure covers both a routine annual monitoring and a special monitoring that shall be taken after a severe storm or a severe earthquake.

6.1 Perform SPF 84.122.01-2 for a routine annual canal bottom monitoring. The annual monitoring should be conducted in calm season between April and October.

6.2 SPF 84.122.01-1 shall be performed after each storm with an onshore wind exceeding 23 MPH. Results from Step 1.7 will determine whether canal bottom monitoring stated in SPF 84,122.01-2 shall be taken. The sedimentation monitoring survey shall be conducted within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> af ter a severe storm.

6.3 SPF 84.122.01-2 shall also be performed after the annunciator is triggered by an earthquake with ground acceleration greater than 0.lg, the OBE level l

earthquake. The canal bottom monitoring shall be conducted within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a severe earthquake. Verification that the source of the seismic alarm annunciator was an earthquake may be made by calling the U.S. Geological Center, Golden, Colorado, at 303-236-1500.

7.0 MATERIALS AND/OR TEST EQUIPMENT N/A SP 84.122.01 Rev. 4 l Page 2

8.0 PROCEDURE

- 8.1 SPF 84,122.01-1 shall be used for the determination of storm severity.

8.2 SPF 84.122.01-2 shall be used for the canal bottom sediment deposition monitoring.

8.3 Watch Engineer shall be notified anytime a step of SPF 84.122.01-1 or SPF 84.122.01-2 cannot be performed.

9.0 ACCEPTANCE CRITERIA 9.1 The volume of sediment above -12 feet MLW USGS (Mean Low Water United States Geological Survey) datum deposited on the intake canal bottom in a segtion 25 feet on either side of a given transect shall not exceed 50 (x) ft ; where x equals the width of the canal bottom along the given transect (i.e., the sediment depth shall average no more than one (1) foot above the intake canal bottom elevation of -12.0 feet MLW).

10.0 FINAL CONDITIONS 10.1 If the conditions of Section 9.0 cannot be met within 3 d_ays after this survey has been taken, the action statements as specified by Reference 11.1 shall be taken.

11.0 REFERENCES

11.1 Technical Specification, Section 3/4.7.1.4 11.2 Safety Evaluation Report, Shoreham Nuclear Power Station, Unit 1, NUREG 0420, Sections 2.4.5, 2.4.7, and 2.4.9 11.3 SP 12.016.01, Surveillance Program 11.4 Stone & Webster Eng. Corp., Calculation Number 19.6A-4-78 11.5 Stone & Webster Eng. Corp., Computer Program EN-175, " Sediment Deposition Between Jetties" 11.6 FY-1A-13, S&W, Site Plan, M-10826-13 I

11.7 FY-2E-2, S&W, Excavation and Grading, Sheet 5, Sections and Details, M-13139-2 11.8 FY-2B-12, S&W, Excavation and Grading Spec., Sheet 2, Intake Canal -

Dredging, M-10829-12 11.9 LILCO Survey Division Procedure for Intake Canal Sounding at Shoreham Nuclear Power Station - Unit 1 11.10 SP 12.021.01, Control of Engineering Calculations 11.11 S.E.R. 2.4.5 (Pg. 2-13)

  1. Y SP 84,122.01 Rev. 4 Page 3

e 12.0' APPENDICES

  • - 12.1 Figure 1 - Definition of Wind Sectors 12.2 Figures 2 through 7 - Monitoring Charts 12.3 Figure 8 - Grid Layout for Intake Canal Bottom Monitoring 12.4 SPF 84.122.01-1, Intake Canal - Severe Storm Determination 12.5 SPF 84.122.01-2, Intake Canal - Canal Bottom Monitoring

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SP 84.122.01 Rev. 4 Page 6

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App:ndix 12.4 Page 1 of 2 INTAKE CANAL - SEVERE STORM DETERMINATION Signature Initials Time Date Authorization for Start (Watch Engineer)

Initiated by Completed by Reviewed by St p No. Procedure Initials PREREQUISITES

1. Obtain permission from the Watch Engineer.
2. The following monitoring equipment shall be functional:

Tide Level Indicator 1N71LT048 Tide Level Recorder 1N71LR048 10 Meter Wind Anemometer --- -

Translator for Wind Speed 1P64-SCT001 Translator for Wind Direction IP64-SCT002 10 Meter Wind Recorder IP64-XR501 Seismic Switch 1Z94-ZS001 Seinmic Trigger 1Z94-ZS002 Response Spectrum Recorder 1Z94-ZR004 with Annunciator PROCEDURE

1. Read Recorder IP64-XR501 and record:

Wind Speed (average) MPH Wind Direction Duration hours

2. Is the wind speed averaging 23 MPH or greater?

Yes Continue procedure No Terminate procedure SPF 84.122.01-1 Rev. 4 SP 84,122.01 Rev. 4 Page 13

App;ndix 12.4 Page 2 of 2

3. Is the wind speed averaging 47 MPH or greater?

Yes Complete this surveillance and initiate surveillance procedure SP 84,122.02, Intake Canal - Jetties and Armor Monitoring.

No Continue on with next question.

4. Is the wind direction between 0* to 72* or 288* to 360*?

Yes Proceed to Step 5 No Terminate procedure

5. Read Recorder IN71LR048 and record the lowest water level,during storm:

feet MLW

6. From Figure 1, select the appropriate Monitoring Chart (Figures 2 through 7) based on wind direction as recorded in Step 1.
7. Using the appropriate Monitoring Chart (Step 6), identify the point of intersection of average wind speed and wind duration obtained in Step 1.

Is the interseition of wind speed and wind duration ABOVE the low water level curve as recorded in Step 5?

Yes Proceed to Step 8 No Terminate procedure

8. Initiate a Canal Bottom Monitoring Survey using Appendix 12.5 of this procedure.

SPF 84.122.01-1 Rev. 4 SP 84,122.01 Rev. 4 Page 14

App:ndix 12.5 Page 1 of 4 INTAKE CANAL - CANAL BOTTOM MONITORING Signature Initials Time Date Authorization for Start (Watch Engineer)

Initiated by Co;pleted by Rsviewed by Step No. Procedure Initials

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PREREQUISITES

1. Contact surveyors to schedule performance of this activity.
2. Obtain permission from the Watch Engineer.
3. Coordinate testing with the Control Room Operator.
4. Notify OQA prior to performing surveillance so they may audit the performance if they so elect.
5. Notify Security prior to performing surveillance.

SPF 84,122.01-2 Rev. 4 SP 84.122.01 Rev. 4 Page 15 l

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App:ndix 12.5 Page 2 of 4 PROCEDURE 1.0 Canal Bottom Monitoring 1.1 Conduct a canal bottom monitoring survey of the intake canal, based on a network composed of an east-west transect every fifty feet and a sounding twenty-five feet along each transect for the bottom section of the canal (Figure 8). The measurements shall extend 150 feet seaward of the end of the jetties, and the survey shall be conducted with calm seas or with wave heights no more than 1.5 feet to ensure accuracy of i 0.1 feet. Also, the survey should be conducted in daylight and at high tide. The horizontal location of the sounding shall be within 5 feet.

The survey was completed as described in the above paragraph.

Signature Date 2.0 Identification of Canal Bottom Conditions 2.1 Abnormal Elevation Changes 2.1.1 Verify, for all transects, there is no elevation greater than or equal to -5.9 MLW. Identify these transects.

There is/are transects with elevations -5.9 feet MLW.

Signature Date There is/are no transects with -5.9 feet MLW.

Signature Date 2.1.2 Search for abnormal bottom elevation changes occurring in the canal. Find and identify the maximum depth differential in the measured area.

The maximum depth differential feet The above data is acceptable as specified in precaution Step 4.2:

Yes No Signature Date If No, notify Hydrological Engineer about above condition.

Signature Date SPF 84.122.01-2 Rev. 4 SP 84.122.01 Rev. 4 Page 16

App:ndix 12.5 Page 3 of 4 2.2 Sediment Deposition Monitoring Average Height Calculation 2.2.1 Identify the location of the highest elevation in the canal bottom.

2.2.2 Identify these transects: the transect with the maximum elevation (from Step 2.2.1) plus the adjacent transects north and south.

2.2.3 Take the straight average of the highest bottom elevation on the three chosen transects. (If the highest bottom elevation is found on the most northerly transect. 125 feet seaward of the jetties, then the two transects south of that transect are to be included in the averaging process.)

2.2.4 The average bottom elevation above -12 feet MLW Feet 2.2.5 An independent Plant Engineer will verify calculation in Steps 2.2.1 to 2.2.4.

Signature Date 2.2.6 The above date is acceptable as specified in Acceptance Criterion 9.0:

Yes No Signature Date If above answer is yes, stop procedure now.

Check If above answer is no, continue with next method.

Check SPF 84.122.01-2 Rev. 4 SP 84.122.01 Rev. 4 Page 17 l

Appendix 12.5 Page 4 of 4 e

2.3 Sediment Deposition Monitoring - Volumetric Average Calculations 2.3.1 Identify all transects which have a bottom elevation of

-11.0 feet or greater.

2.3.2 Find the cross-sectional area of the sediment deposition for each transect which has been identified in Step 2.3.1. This can be accomplished by using a summation of appropriate rectangular and triangular areas on the transect drawing (provided from Step 1.0 of this SPF).

Area above -12.0 feet MLW 1evel will be subtracted from the total.

2.3.3 The total cross-sectional area found for each tra'nsect will then te multiplied by 50 feet (25 feet on each side of given transect). This will yield a volume representing the sediment deposited above the canal

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bottom elevation of -12.0 feet MLW.

2.3.4 An independent Plant Engineer will verify calculation in Steps 2.3.1 and 2.3.3.

2.3.5 The numbers obtained from each calculation of Step 2.3.3 should be compared against the acceptance criterion for that transect.

Above test is acceptable according to Criterion 9.0.

Signature Date Above test is unacceptable according to Criterion 9.0.

Signature Date SPF 84.122.01-2 Rev. 4 SP 84.122.01 Rev. 4 Page 18

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OVERSIZE DOCUMENT PAGE PULLED  ;

SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS ,

APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC ,

FTS 492 = 8989 l

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