ML20198S539

Rev 2 to Nuclear Station Engineering Instruction Nsei CS-4, UHS Monitoring. W/860522 Advance Instruction Change 1

ML20198S539
Person / Time
Site:	Clinton
Issue date:	02/21/1986
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20198S533	List: ML20198S528 ML20198S539
References
NSEI-CS-4, NUDOCS 8606100473
Download: ML20198S539 (11)

Text

.

ADVANCE INSTRUCTION CHANGE (NSEI CS-4, Rev. 2, AIC No. 1) 3 ///,/

CONCURRENCE: /V M APPROVED:gj [N L y,A .

Qu'ality Assurance g Ng Supervisor-Civil /

Structural t .f'Nl. l DATE: 5/ % s/.% .

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The following advance change $plie,ss to Instruction CS-4, Ultimate Heat Sink Monitor , ., lT,,

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LOCATION CHANGE /,AhkdM.

s cv NSEI CS-4, De1 isting Reference 11.5 (CPS Procedure Rev. 2 . . and replace by:

Page 5

• rence T

11.5 Technical Spec. 3/4.7.1.2 and 6.8.4D 11.6 SER Section 2.4.5.1 11.7 SER Supplement 1, Section 2.6.5.5 Mk' $E.h.'

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Nuclear Station Engineering Instrucdon DATE t / s tI e,c , NSEI A CS-4, Rev. 2 /

.h- APP -

/

Supeyvisor Quality Assurance TITLE: ULTIMATEHEATSINKMONDRh 1.0 PURPOSE The purpose of this re is to delineate the requirements for monitoring th ural integrity and functional capability of the Ultimate k (URS).

2.0 DISCUSSION /DEF ONS The structural integrity of the Ultimate Heat Sink is paramount in ensuring it is capable of performing its design function. Due to the unique environmental location of the UHS, it may be

' subjected to uncontrolled natural phenomena such as silting ,

erosion, earth slides or earthquake damage. Periodic surveillance of the UHS' structure is thus necessary to verify that its functional capabilities have not been impaired.

3.0 RESPONSIBILITY The Supervisor - Civil / Structural Engineering is responsible'for implementing and reviewing this procedure.

4.0 PRECAUTIONS None. ,

., .pp - . T~~~ " - ~ ' ~ ~ ; -- -

5.0 PREREQUISITES - -

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J': . ; ,.

None.

6.0 LIMITATIONSANDACTIbb ~~'"~~~"-~-- - - - - - -

6.1 If total' sediment reaches 218 acre-feet, notify CPS Director -

Technical to dredge the UHS. (See Exhibit 1 to determine maximum deposits.)

6' . 2 If total sediment. elevation is. greater than 672 feet (msl) at more than two adjacent 500 feet x 500 feet sections, notify CPS Director - Technical to dredge'the involved sections. (Sections defined by points contained in Figure 2.)

6.3 If there is not a sufficient volume of water in the'URS to maintain the plant in Operation for 30 days under the meteorolog-ical conditions defined in Regulatory Guide 1.27, notify CPS Director - Technical.

CS-4(1) ei.e.t-*=e-e.we e,*e .w.-o .e=w+ * , oe.e - - e* = ,. -= g

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}'f 6.4 If there is structural cracking in any UHS concrete structure (1 that is detrimental to the safe operation of the UHS, notify CPS Director - Technical.

t 6.5 If abnormal hazardous conditions are observed during the inspection, notify CPS Director - Technical.

7.0 MATERIALS AND/OR TEST EQUIPMENT

] 7.1 Fathometer, Raytheon Model DE 719B or equivalent.

7.2 Light' meter.

7.3 Boat.

• 8.0 PROCEDURE 8.1 The UHS Report An UHS report shall be prepared annually from monitoring done in the fall and submitted to Plant Central Files and the CPS Director Technical within 30 days of receipt of information from -

the consulting engineering firm. Additionally, UHS monitoring

, and report shall be. prepared after a major flood (100-year flood l'

or greater,'where lake level is at 697.0 ft.), after a major drought (100-year or greater drought where lake level is at 682.3 i

f feet), or after a major earthquake (operating basis earthquake or

(. greater as defined-in the FSAR). The UHS report shall include the following:

4

1. Statements as to the reason for the survey, such as annual report, major flood, earthquake, etc.

, 2. Results of Visual Inspection of UHS shoreline.

3. Results of the Sedimentation Monitoring Survey.

4. Resu,lts of the URS Sub nerged Dam Survey.

5. Results of Visual Inspection of Underwater Structures.

l 6. Assessments of the causes of abnormal conditions, evaluation l

of the UHS integrity, and recommendations for additional 4

investigations, remedial measures, or future inspections, l where appropriate.

7. An account of abnormal conditions (floods, seismic events, l extreme reservoir drawdown, etc.) since the previous t inspection.

l 8. Name and license numbers of surveyors, engineers and other I personnel that performed the field work.

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l CS-4(2)

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4 9. Description of the boat and equipment used, and the lake and I weather conditions during the surveys.

10. Summary of recorded daily lake level readings.

8.2 Visual Inspection of UHS Shoreline (To be performed by a consulting engineering firm at least once per 12 months)

. 8.2.1 The URS shoreline shall be observed from both the land and' water (by boat) to determine if scour, erosion, or slope instability has occurred. Scour and erosion

. shall be defined as any area-where the surface vegeta-tion has been disturbed in an area greater than 100 square feet. Slope instability shall be defined as any area where cracks or dislodged trees are noticeable for a distance of 10 feet along the slope. When appli-cable, photographs and detailed sketches of any 4 -

questionable areas shall be documented in the

inspection report.

! 8.2.2 The abutments of the UHS submerged dam at and above the water line shall be inspected from a boat for scour and erosion beneath and around the soil cement slope protection of the submerged dam.

8.3 Monitoring of UHS Submerged Dam (To be performed by a consult'ing

. engineering firm at least once per 12 months) 8.3.1 Annually, a fathometer (Raytheon Model DE719B or equal) will be used to measure and record continuous eleva-l- tions along the crest of the submerged dam. Continuous j -

elevation readings will also be taken for transverse sections of the submerged dam at intervals of 250 feet, measured from the permanent control system, alternating 1

annually between 225 feet, 475 feet, 725 feet, etc.,

and 100 feet, 350 feet, 600 feet, etc. (see Figure 1),

i Readings for transverse sections at Stations 3+50,

,11+00 and 18+50 will be taken during each survey for a continuous record and comparison of the UHS dam slopes.

, 8.3.2 Whenever the'results of the fathometer soundings indi-

) cate that an area of the crest of the submerged dam is 0.5 feet below the elevation of the crest as estab-lished in the 1982 survey, a resurvey will be

! performed, then an evaluation of the capacity of the

UHS will be_made to ensure that the UHS still has its i

30 day minimum capacity. If the capacity is not sufficient, a request to the CPS Director - Technical l to put the plant into a Safe Shutdown condition until the situation is remedied shall be made and QA shall be notified, i

L CS-4(3)

U 8.4 Sedimentation Monitoring (To be performed by a consulting C engineering firm at least once per 12 months) l 8.4.1 Permanent horizontal and vertical control points have been established around the perimeter of the UHS to provide the base for the sedimentation monitoring program for the UHS. The 30 designated monitoring points will be located from these control points (see Figure 2 and Table 1).

8 . 4 . '2 The sedimentation monitoring program will be performed annually in the fall of the year.

8.4.3 If the volume ~of sediment reaches 218 acre-feet a dredging program will be undertaken. (See Exhibit 1 to determine maximum sediment deposits.)

8.4.4 .

If the sediment elevation reaches 672 feet (msl) at more than two adjacent sections a dredging program will be undertaken. (Sections defined in Figure 2.)

. 8.5 Visual Inspection of Underwater Structures (To be performed by a i consulting engineering firm at least once per 12 months) I 8.5.1 A diver under the direction of a qualified engineer will inspect the concrete structures (SX Outlet

( Structure and the Intake Screenhouse) for silt or debris accumulation at the intake or discharge points.

The concrete structures will also be inspected for concrete deterioration, significant detrimental structural cracking, foundation undermining resulting from scour, and movement along construction joints.

CAUTION PRIOR TO UTILIZING DIVERS TO INSPECT THE INTAKE SCREENHOUSE, CONTACT IP OPERATIONS GROUP FOR APPROPRIATE APPROVAL AND PRECAUTIONARY MEASURES. -

8.5.2 Whenever significant detrimental structural cracking, :

concrete deterioration of more than .5 inches in depth; over an area larger than five square feet is noticed in any URS concrete structure, or scour beneath a UHS structure of more than one foot for a distance of 5 feet is reported, an evaluation of its effect on the structure shall be made and a, report submitted to the CPS Director - Technical. Ih it is determined that the condition is detrimental to f.he safe operation of the UHS, notify CPS Director - Technical.

8.6. Records f All UHS reports and all data and reports that make-up the UHS

( report (Reference 8.l'of this Instruction) shall be submitted to CPS Central Files and kept for the life of the plant.

CS-4(4) .

1 9.0 ACCEPTANCE CRITERIA 9.1 Depth sounding shall be made within a 5-foot radius of each the 30 listed points.

9.2 The depth soundings shall be made with an accuracy of 0.1 foot.

9.3 The crest of the submerged dam must not be greater than 0.5 feet below the elevation established in the 1982 survey or an evaluation of the capacity of the UHS will have to be documented.

9.4 ifhen 20% of the UHS capacity is unavailable due to sedimentation, an evaluati.on will be made for immediate dredging.

9.5 No significant detrimental structural cracking, concrete deterioration of more than .5 inches deep and five square feet in area, or scour beneath a UHS structure more than one foot deep for a distance of five feet shall be evident or an evaluation of the effect on the structure will have to be documented.

9.6 When areas of erosion greater than acceptable levels are identified, an evaluation of the capacity of the UHS as well as structural integrity.will have to be documented.

NOTE: These limits do not preclude good engineering judgement made with respect to excessive local sediment deposits which might cause (1) loss of UHS water inventory due to displacement by alluvial flow slides, (2) loss of shutdown service water due to blockage of pump suctions, (3) loss of UHS circulation pattern due to blockage across the water flow path, or (4) loss of UHS water inventory

, because the UHS dam or its flanks are breached by the

-f$$ combination of seismic loadings, liquefaction and g$.e. washout.

in .

',,'~ 10.0 FINAL CONDITIONS None.

11.0 REFERENCES

11.1 10CFR50, Appendix A, Design Criteria 45.

11.2 CPS FSAR; Sections 2.4, 2.5, and 9.2.

t 11.3 Clyde E. Williams & Associates; Aerial Survey of UHS, Drawing No.

CLO-03-S-034.

11.4 Regulatory Guide 1.;27, Rev. 2, January 1976.

11.5TechnicalSh'ec. 3/4.7.1.2 and 6.8.4D.

AIC 11.6 SER Section 2.4.5.1 af 11.7 SER Supplement 1, Section 2.6.5.5 CS-4(5)

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(. 12.0 APPENDICES A. Determination of Maximum Allowable Sediment Deposits in the UHS (see Exhibit 1).

13.0 DOCUMENTS As generated from Section 8.6 of this Instruction.

14.0 ATTA'CHMENTS Attachment CS-4-1, Determination of Maximum Allowable Sediment Deposits in the UHS.

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f PROC CS-4(6)

DETERMINATION OF MAXIMUM ALLOWABLE SEDIMENT DEPOSITS IN THE UHS From FSAR, subsections 1.8, 2.4'.11.6 and 9.2.5, the committed design volume of the UHS is as follows:

Minimum Cooling Capacity 590 acre-feet SSE Liquifaction Sedimentation 221 acre-feet Fire Protection Requirement 3 acre-feet Sediment inflow - 100 yr. flood 35 acre-feet Total required volume = 849 acre-feet From the as-built dimensions, the UHS has a surface area of 158 acres and a. volume of 1067 acre-feet.

Thus: .

i-1067 acre-feet (as-built)

- 849 acre-feet (design) ,

{ 218 acre-feet (excess)

The excess volume will accommodate sedimentation before the committed volume of 849 acre-feet is threatened.

Therefore:

i 218 acre-feet

= 1.38 feet 158 acres Rounded off to 1.4 feet of allowable sedimentation.

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