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Forwards Changes to GL 89-10,Suppl 6 Commitments W/ Justification & Clarification
	ML20092B531
Person / Time
Site:	Cooper
Issue date:	09/06/1995
From:	Mueller J; NEBRASKA PUBLIC POWER DISTRICT
To:	; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	GL-89-10, NLS950182, NUDOCS 9509120058
	Download: ML20092B531 (9)
	v • d • e

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p' M Nebraska Public Power District P.O. Box NED ASKA 68321 "iE% i NLS950182 September 6,1995 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555

Subject:

Changes to Commitments with Justification and Clarification; Generic Letter 89-10 Activities Cooper Nuclear Station NRC Docket 50-298, DPR-46

Reference:

1)

Letter (No. NLS 950006) to U.S. NRC Document Control Desk from G.R.

Horn (Nebras'ka Public Power District) dated January 8,1995;

Subject:

Request for Schedule Extension; Generic Letter 89-10 Testing Schedule 2)

Letter (No. NLS950043) to U.S. NRC Document Control Desk from J.H.

Mueller (Nebraska Public Power District) dated January 27,1995;

Subject:

Revision to Request for Schedule Extension; Generic Letter 89-10 Activities 3)

Conference Call dated August 21,1995, between U.S. NRC and Nebraska Public Power District Gentlemen:

By letter dated January 8,1995, (Reference 1) and a subsequent revision to the letter dated January 27,1995, (Reference 2), the Nebraska Public Power District (District) provided its justification to extend the completion of the initial testing portion of Generic Letter (GL) 89-10 Motor Operated Valves (MOV) program at Cooper Nuclear Station (CNS). In those submittals, the District committed to have completed static testing of a total of 82 MOVs and dynamic testing of a total of 52 MOVs by the end of Refueling Outage (RE-16).

At the present time, the District has completed static testing of 82 MOVs as committed and dynamic testing of 35 MOVs of the 52 committed. As a result,17 MOVs remain to be dynamically tested by the end of RE-16 to meet the commitment for the entire GL89-10 program.

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NLS950182 September 6,1995 Page 2 As discussed in the conference call between the NRC and the District (Reference 3), the District is i

submitting the following changes to its MOV testing plan based on current industry information:

1)

Dynamic testing of 12 out of the remaining 17 MOVs will not be performed.

2)

Dynamic retesting of HPCI-MOV-MO58 will not be performed.

These proposed changes involve revision of commitments made in References I and 2. Attachment I provides the rationale and technicaljustifications for the District's proposed changes. This attachment also contains clarification of the design change commitment made with respect to RR-MOV-MO53A and RR-MOV-53B valves in References 1 and 2.

The high margin approach for 10 MOVs suggested in Attachment I has been described in detailin Attachment II to this letter.

Based on the justification and information provided in Attachments I and II respectively, the District has determined that these proposed changes demonstrate suflicient capability and high confidence level in our MOVs' performance under worst case design basis conditions.

The Attached Table summarizes the GL89-10 MOV commitment status taking into account the proposed changes discussed above.

If you have any questions or require additional information, please contact me.

Sincerely, f

ohn H. Mueller Site Manager JHM/GS/BT/ko cc:

Regional Administrator USNRC Region IV NRC Resident Inspector Cooper Nuclear Station NRC Project Manager USNRC NPG Distribution

Attachment I to NLS950182 Page1o.f2 CHANGES TO GL89-10 SUPPLEMENT 6 COMMITMENTS WITH JUSTIFICATION AND CLARIFICATION Justification For Not Performine Dynamic Testine RCIC-MOV-MOl31, RCIC-MOV-MOl32 - References 1 & 2 committed to dynamic testing these valves, due to a high Probabilistic Safety Assessment ranking. These valves have an active safety function to open only and are flow assisted in the open direction or " service conditions assisted". As such, open direction thrust values would not be conservative for calculating valve factor or capability. Frequently, packing friction load is overcome by the stem rejection force and the data becomes unquantifiable. Dynamic testing of other CNS flow assisted globe valves has shown these behaviors and, therefore, dynamic testing of these two valves does not provide any new and credible information in addition to static testing. Consequently, dynamic testing of these valves is not necessary or prudent.

REC-MOV-700MV, REC-MOV-71 IMV, REC-MOV-714MV, REC-MOV-1329MV, RHR-MOV-MO27B, RHR-MOV-MO66B, SW-MOV-886MV, SW-MOV-887MV, SW-MOV-888MV, and SW-MOV-889MV - These valves were to be static and/or dynamically tested during RE16. Normally these valves would require dynamic testing after static testing to validate calculation results that indicate the valve is capable of performing its design basis function. After performing additional industry reviews and working with other utilities, a different approach and methodology has been used to reevaluate each of these valves. This methodology is termed the "high margin" approach. The conservatism built into this approach eliminates the necessity for dynamically testing these valves. A detailed discussion of this approach is provided in Attachment II.

Justification For Not Performine Dynamic Retestine HPCI-MOV-MO58 - A commitment was made by the District te dynamically test this valve during RE16. The basis for this commitment stems from a hydrostatic test which was performed on this valve during RE14 during which high unseating torque was noted. Since that test, the valve has been reworked (lapped seat) and the actuator refurbished. Three subsequent static diagnostic tests were successfully performed which consistently demonstrated a significant reduction in the unseating torque (106.4 f1-lbs. vs 185.7 fl-lbs.). Although this valve has active safety functions to both open and close, no meaningful data beyond that produced by the static tests is achievable since a hydrostatic test can only be performed in the open direction. Therefore, CNS has determined that a second hydrostatic test is not required for this MOV since 1) reworking the valve corrected the apparent unseating problem and 2) data from the original hydrostatic test produced conservative results with regard to the stem friction coeflicient and valve factor.

1

Attachment I to NLS950182 j

Page 2 of 2 diarification Of Desien Chanigg RR-MOV-MO53 A and RR-MOV-MO53B - These valves were listed as requiring an additional design change. During the 1994 forced outage larger cabling and motors were installed on these valves. CNS engineering is currently conducting an evaluation that will change the design basis stroke time and reduce the valves maximum expected differential pressure. Pending completion of this evaluation, no further modifications to these valves are expected with the exception that a gear change may be required. As a contingency, an alternate plan is to implement a method to limit switch close versus torque switch close the valves.

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- NLS950182 -

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High Margin Approach r

i In order to determine whether an MOV has sufficient capability, all parameters relative to sizing the actuator for the specific application must be considered. Analytical sizing equations -

have many known parameters that can be quantitatively derived such as pressures, seat and i

- stem diameters, stuffing box or packing loads, stem friction coefficients, etc. However, one

unknown that cannot be analytically determined is the valve factor or disc / seat coefficient of

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friction. Resultant data from a dynamic test can provide the means to back-calculate this t

factor, i

8 The need for dynamically testing each MOV in the Generic Letter 89-10 program is to j.

determine specific valve factors and coefficients of friction. With this information,'the

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analytical methodology is then complete and accurate for each application. The minimum i

required thrust values are determined to indicate if the existing motor-actuator has sufficient l

capability for the design basis conditions. Without dynamically testing each MOV to i

quantitatively determine these factors, assumptions are made to complete the theoretical analysis. The confidence level in this approach is directly related to the basis for the information and validity of the justification supporting the assumption.

l 1

The high margin approach involves a theoretical design method using conservative parameters to envelope the required design basis values. This approach does not require dynamic testing to validate the assumptions made in the theoretically determined design basis values. This i

method is based on three criteria: 1) the amount of margin available after optimizing the

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j actuators, if necessary; 2) adjusting the thmst output for each MOV as high as possible in its analytically calculated window, if necessary; and 3) assessing the results ofindustry and plant data for similar MOVs. The determination that this methodology conservatively bounds the design requirements is based on information and data obtained from CNS specific dynamic testing and other applicable industry testing. This approach is only used for MOVs with low MEDPs and/or valves originally designed with conservatively sized actuators (i.e., very large l

margins). When using this approach, each MOV or family group is evaluated on a case-by-case basis.

The conservatism used in this approach ensures a high confidence factor in MOV performance capability. Ample margins in both opening and closing directions allow for degrading effects such as stem lubrication degradation, unknown flow and temperature effects, seat / disc i

coefficient of friction degradation, and/or any other types of unforeseen / unknown degradation.

The net result of this approach is an MOV with a maximum capability and reliability to exceed its design requirements while fulfilling its design basis function under the worst j

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' NLS950182 Page 2 of 2 operational conditions.

This methodology is performance-based and is considered welljustified based on review of actual test results obtained from numerous sources of testing includiq, Jte specific tests at CNS, EPRI sponsored testing, and other industry testing and initiatives. In addition, the approach and philosophy are considered by the District to be in compliance with the Generic Letter 89-10 requirements.

The following Table is an example of present actual test results and an estimation of potential results using the conservative high margin approach. These numbers are not a commitment but provide information as to how~much improvement and assurance of performance the high margin approach can add to the valve's capability to perform under design basis conditions.

CLOSED DIRECTION APPLICATION Current Raw Currert New Percent Projected Projected Percent Allowance MRST Currert Margin MRST increase CST g Margin increase for

@ VF CST Above

@ VF Over old Midde of Above Over old Thrust

(.5 & 1.1)

Thrust MRST (1.0 & 2.0) MRST Window MRST VF increase Valve Number lbs

lbs, lbs.

lbs.

8 CST & MAX REC-MOV-700MV 5242 9599 83 9332 78 12064 29 130 Kalsi/1.4%

REC-MOV-711MV 3334 5885 76 4310 29 5977 39 79 Gear chg. & Spring Pack (S.P.)

REC-MOV 714MV 3334 5945 78 4310 29 5330 24 60 Kalsi/1.4%, S.P. & Gear chg.

REC-MOV-1329MV 4786 7188 50 8458 77 14029 66 193 Kalsi/1.4% & S.P.

RHR-MOV-MO278 70588 90296 28 122319 73 150160 23 113 Gear ratio Chg.

RHR-MOV-MO66B 25301 80185 217 43023 70 82262 91 225 Presently capable SW-MOV-888MV 1488 3497 135 2355 58 5246 123 253 Presently capable SW-MOV-887MV 2058 4304 109 2537 23 5567 119 171 Presortly capable SW-MOV-888MV 1551 2931 89 2532 63 5334 111 244 Presortly capable SW-MOV-889MV 1551 3544 128 2532 63 5334 111 244 Presertly capable OPEN DIRECTION APPLICATION Cunert Currert Currert New Percent New New MRST Limitmg Margin MRST Increase Limiting Margin A,lovence i

@ VF Open Above

@ VF Over old Open Above for i

(.5 & 1.1)

Thrust MRST (1.0 & 2.0) MRST Thrust MRST Open Allovable Valve Number

Ibs, Ibs lbs lbs increase REC-MOV-700MV 4061 12134 199 7275 79 12134 67 Presortly capable

REC-MOV-711MV 2789 4851 75 3397 23 6352 87 Gear chg. & Spring Pack (S.P.)

REC-MOV-714MV 2789 4835 75 3397 23 5292 56 S.P. & Gear chg.

REC-MOV-1329MV 3934 11460 191 6701 70 11460 71 Presortly capable

RHR-MOV-MO27B 4000 142564 3464 5000 25 192000 3740 Gear ratio Chg.

RHR MOV-MOS6B 6806 121500 1685 14261 110 121500 752 Presortly capable SW-MOV-888MV 1379 5756 317 2246 83 5756 156 Presortly capable SW-MOV-887MV 1921 7061 268 2400 25 7061 194 Presently capable SW-MOV-888MV 1429 5756 303 2409 69 5750 139 Presently capable SW-MOV-889MV 1429 5756 303 2400 69 5756 139 Presertty capable

Data shown assumes that the appropnote actuator gent change has been implemerged.

Nomenclature:

MRST = Minimum Required Stem Thrust VF = Valve Factor CST = Close Stem Thrust (at torque switch tnp)

MAX = Maximum thrust closed HQTE:

.5 & 1.0 are the industry standard and NRC accepted valve factors for gate and globe valves respectively, j

however, the rnore conservative 1.0 & 2.0 valve f actors are used in the high rnargin calculations for gate and globe valves respectively.

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f LIST OF NRC COMMITMENTS ATTACHMENT 3 l C6Yrespondence No: NLS950182 The following table identifies those actions committed to by the District in thit document. Any other actions discussed in the submittal represent intended or planned actions by the District. They are described to the NRC for the NRC's information and are not regulatory commitments.

Please notify the Licensing Manager at Cooper Nuclear Station of any questions regarding this document or any associated regulatory commitments.

)

l COMMITTED DATE COMMITMENT OR OUTAGE

1. Dynamic testing of the following MOVs will be performed:

9 CS-MOV-M0128 (RE-16)

REC-MOV-702MV REC-MOV-709MV SW-MOV-650MV SW-MOV-6SIMV

2. Spring packing and/or gear ratio changes will be performed on the following MOVs:

Refueling Outage REC-MOV-711MV (RE-16)

REC-MOV-714MV REC-MOV-1329MV RHR-MOV-MO27B i

J l

REVISION NUMBER 0 l

PAGE 10 OF 16 l

PROCEDURE NUMBER 0.42 l

.

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