ML20236N590

Discusses SPDS Safety Evaluation Issues Re Fire Protection, Software Validation & Verification & Electrical Isolation. Listing of Status of Each Issue & Comparison of Nonlinear Data Points in Final Acceptance Test Encl

ML20236N590
Person / Time
Site:	Rancho Seco
Issue date:	11/09/1987
From:	Croley B SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Miraglia F Office of Nuclear Reactor Regulation
References
DTS-87-102, TAC-56525, NUDOCS 8711160243
Download: ML20236N590 (10)

Text

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$'# '1SMUD SACRAMENTO MUNICIPAL OTILITY DISTRICT C P. O. Box 15830, Sacramento CA 95852-1930,(916) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA NOV 0 S 1987 ,

1 DTS87-102 ,

U. S. Nuclear Regulatory Commission Attn: Frank J. Miraglia, Jr.

Associate Director for Projects Phillips Building 7920 Norfolk Avenue Bethesda, MD 20014 4

DOCKET 50-312 RANCHO SECO NUCLEAR GENERATING STATION LICENSE NO. DPR-54 SPDS ADDITIONAL INFORMATION FIRE PROTECTION /SOFTWAllE VALIDATION AND VERIFICATION / ELECTRICAL ISOLATION

Dear Mr. 1;iraglia:

This letter addresses three issues of the SPDS ongoing safety evaluation being conducted by the staff. These issues were identified either as requiring additiolial information or as needing further discussion. Tne issues are as follows:

1. Quality and properties of the fire protection cable wrap

2. Scftware validation and verification

3. Adequacy of electrical isolation devices to withstand the maximum credible fault During the courso of the NRC audit at Rancho Seco on October 26, 1987, the staff reviewed the SPDS and was provided additional information. A listing of this information and a discussion of the status of each issue is included as Attachment 1. In r2sponse to a staff request, a comparison has been prepared of all-non-linear data points included in the SPDS final acceptance test. This comparison is included as Attachment 2.

8711160243 g71109 DR ADOCK 050 2 oO

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RANCHO SECO NUCLEAR GENERATING STATION O 14440 Twin Cities Road, Herald, CA 95638-9799;(209) 333 2935

l B. Croley DTS87-102 It is-our understanding that sufficient additional information has been provided for Issues 1 and 3.to allow the staff to complete their safety evaluation. With this submittal, the only information remaining on Issue 2, Software Validation,'is to provide a copy of the. final SMUD test results and a list of any deviations that might have occurred. This information will be provided as suon as it becomes available. It is our understanding that this information is considered to be a non-restart issue.

Please contact me if you have any questions. . Members of your' i staff with questions-requiring additional information or i clarification may contact John Atwell at (209)-333-2935, )

extension 4917. j Sincerely, j j/b/h(.e<be?'

Bob Croley Director, Nuclear Technical Services cc: G. Kalman, NRC, Bethesda w/ attach A. D'Angelo, NRC, Rancho Seco w/ attach J. B. Martin, NRC, Region V w/ attach

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. B..Croley s -

i DTS'87-102 .

Attachment.1 Page 1 SPDS Review Issues:  ;

. A. ' Quality and Properties of Fire Protectio'n Cable Wrap During an NRC audit at the SMUD site on October 26, 1987-the staff viewed the cable routing for the SPDS and conducted'

. detailed discussions with SMUD Engineers to focus on the type, l quality-and material properties of the fire protection wrap.that i has:been used. In.several locations the Class 1 cables have been- '

. fire-wrapped for compliance with the requirements of Appendix R Eto 10 CFR 50.

1 In the first location, Channel B cabling from the SPDS Control j Panel (HISS) to.the SPDS Computer (H4SPDS) has been routed

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outside the confines of the. Control Room through the Channel A fire area. This section of Channel B cabling has been. supplied i with one hour fire wrap consisting of three layers of 3M fire wrap tape (Part Number E54A).

The remaining' locations.for 21re wrap are between multiplexer where data bus cables are redundant and identical and where the same cables are routed entirely outside the confines of the  !

Control Room. .One data bus cable between multiplexer #7 I f(H4CDAR7) and multiplexer #1(H4CDARl), and one data bus cable between multiplexer #9(H4CDAR9) and multiplexer #1(HACDARl) have been supplied with three hour fire wrap consisting of three layers of 3M fire wrap tape (Part Number E50D).

It is our understanding that the staff agrees with the extent of  ;

fire wrapping and agrees with the type and quality of fire wrap {

tape that was.used. No further submittals on this subject are 1 planned.

)

1 B. Software Validation and Verification During the on-site audit of October 26, 1987, the staff received the following additional information relating to SPDS software validation and verification testing results:

1. " Safety Parameter Display System Operating Manual",

1. 1169845, including Manual Revision Notices No.1 through No. 5 and all listed appendices.

2. " Safety Parameters Display System Functional Description", ,

1. 1134042 '

l 3. "SMUD Safety Parameter Display. Flow Charts", #1137422

4. "SPDS Source Code Listing and ROM Dump", #1137402 l

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B.'Croley DTS87-102 l Attachment 1 Page 2

5. "SPDS Dummy Data Handler ANATEC Interface Software",

1. 1169630

6. "SPDS ANATEC Interface INTEL Software", #1169679

7. "SMUD Safety Parameter Display Load Plan", #1137500

8. "SMUD Safety Parameter Display Load Plan Calc. File", ,

1. 1138663 l

9. "SMUD SPDS Software Verification and Validation Plan", 51-1155495-01

10. "SMUD SPDS Software Verification Plan", 51-1155 96-01

11. "SMUD SPDS Functional Description Review", 51-1155625-02

12. "SMUD SPDS Software Validation Plan", 51-1155637-05

13. "SMUD SPDS Software Validation Plan", 51-1155637-06

14. "SMUD SPDS Software Validation Plan",- 51-1155637-07

15. "SMUD SPDS Software Validation Report", 51-1156740-04

16. "SMUD SPDS Software Validation Report", 51-1156740-05

17. "SMUD SPDS Software Validation Report", 51-1156740-06

18. " Final Software Verification and Validation Report for SMUD SPDS", 51-1158312-01

19. B & W Letters, S. C. Gallier to Dan Prosch, dated October 28, 1987 Item 1

" Figure 2. Relation of Verification and Validation to SMUD SPDS Software Development" as modified to include the V & V plans, reports and discrepancies.

Item 2 "V & V discrepancy notices log which includes the following:

a. Discrepancy Notice Numbers

b. Documents

c. Description and Initiation Response Dates

d. Notation of Whether the Discrepancy Was Discovered During Verification or During Validation Phase.

l 4

l B. Croley )

DTS87-102 1

) Attachment 1 Page-3

20. B & W Letter, S. C. Gallier to Dan Prosch, dated October 27, 1987 -

Item I SMUD SPDS Discrepancy Notices That Are Referenced in Final Software Verification and Validation Report, 51-1158312-01 As a result of conversations with the staff subsequent to the audit, SMUD has prepared a comparison of all non-linear data points that have been included in the SMUD final acceptance test.

This comparison is included as Attachment 2 to this letter.

With this submittal, the only information remaining on this issue is a final SMUD report of the test results including a list of any deviations that might have occurred. This information

.will be provided as soon as it becomes available. It is our understanding that this inf rmation is considered to be a non-restart issue.

C. Adequacy of Electrical Isolation Devices to Withstand the Maximum Credible Fault SMUD had previously submitted preliminary test results to the staff.on the adequacy of the electrical isolation devices for SPDS. During the plant site audit of October 26, 1987, the staff held discussions with SMUD and reviewed the final test reports.

During the course of this discussion and review, SMUD confirmed to the staff that there are no changes in the final test reports from that of the preliminary submittal. It is our understanding that the staff has been adequately assured that the test data does demonstrate the adequacy of the isolation devices to withstand the maximum credible fault. No additional submittals on this issue are planned.

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ATTACHMENT 2 COMPARISON OF NON-LINEAR POINTS INCLUDED IN j '

STP 789-ACCEPTANCE TEST FOR SPDS MODIFICATIONS Tabulation of all data points tested in SPDS which required' conversion to Engineering Units (EU) by methods other than linear conversion Logarithmic Scaling Point Point Input EU Expected Value Observed Value No. ID Range-V Range 20% 60% zu7. Bu%

1 G9000 0-10 1.0E-1 TO 1.0E6 CPS 2.51E0 3.98E4 2.47E0 3.93C4-2 G9001 0-10 1.0E-1 TO 1.0E6 CPS 2.51E0 3.98E4 2.52E0 . 4.02E4 3 G9002- 0-10 1.0E-11.T0 1.0E-3 AMPS 3. 98E-10 2.51E-5 3.96E-10 2.52E 4 G9003 0-10 1.0E-11 TO 1.0E-3 AMPS 3.98E-10 2.51E-5 3.99E-10 2.54E-5

'105 R9044 1-5 1.0E-1 T0 1.0 Ell uCi/S 2.51El 3.98E8 2.61El 4.19E8 106 R9045 'l-5 1.0E-1 TO 1.0 Ell uCi/S 2.51El 3.98E8 2.50E1 3.95E8 j 107 R9046 1-5 1.0E-1 TO 1.0E11 uCi/S 2.51El 3.98E8 2.50E1 3.98E8 108 R9047 1-5 1.0 T0 1.0E5 mR/HR 1.0E1 1.0E4 1.04El 1.04E4 109 R9048 1-5 1.0 TO 1.0E5 mR/HR 1.0El 1.0E4 1.00E1 9.97E3 38 R9049 1-5 1.0 T0 1.0E8 R/HR 3.98E1 2.51E6 3.99El 2.54E6 39 R9050 1-5 1.0 TO 1.0E8 R/HR 3.98El 2.51E6- 3.93E1 2.50E6 Square Root Conversion Point Point Input EU Expected Value - Observed Value No. ~ID Range-V Range 20% 80% 20% 80%

47- F9000 -10 TO 10 0-50 GPM 111 223 111 223 49 F9001 1-5 0-600 GPM 268 536 268 536 51 F9002 1-5 0-600 GPM 268 536 267 536 50 F9003 1-5 0-600 GPM 268 536 268 536 52 F9004 1-5 0-600 GPM 268 536 267 536 4 53 F9005 1-5 0-5000 GPM 2236 4472 2235 4472 54 F9005 1-5 0-5000 GPM 2236 4472 2228 4469 100 F9010 1-5 0-80 GPM 35 71 35 71 48 F9015 -10 TO 10 0-160 GPM 71 143 71 143 94 F9660 1-5 0-1300 GPM 581 1162 580 1162 27 F9661 1-5 0-1300 GPM 581 1162 579 1161 28 F9662 1-5 0-1300 GPM 581 1162 580 1162 93 F9663 1-5 0-1300 GPM 581 1162 580 1162 Summary of test results:

1. Observed values for all data points which used square root or logarithmic conversion to EU's were all within the tolerances specified in the procedure.

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2. There were no points identified in the SPDS Signal List as requiring square root q or logarithmic conversion which were not converted by the system program.  ;

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Page 2 of 5 l ATTACHMENT 2

3. There were two data points (F9600, Point No. 25, and F9601, Point No. 26) which were identified as linear in the SPDS Signal List, but were converted to EU's using square root.

Input Range (V): -10 to 10; EU Range: 0-6. 5 MLB/liR Expected Value: 20% = 1.3; 80% = 5.2 Observed Value: 20% 80%

F9600 2.9 5. 8 F9601 2.9 5. 8 - These would be expected values for square root conversion.

I This is listed as Discrepancy 17 in Test Log entry 73. l 4 There was one data point (P9052, Point No. 78) which was identified as normal count l range (0-4095) which system did use for conversion, but actually should have been l identified as narrow count range (819-4095).

Input Range (V): 1-5; EU Range: -5 to 180 PSIG Expected Value: 20% = 32; 80% = 143 Observed Value: 20% 80%

P9052 61 150 - These would be the expected values for a 0-5 V input range for inputs of 1.8V and 4.2V respectively.

This is listed as Discrepancies 6 and 7 in Test Log entries 29 and 30.

5. There were two points (T9012, Point No. 80 and T9013, Point No. 79) which were identified as narrow count range (819-4095), which system did use for conversion, but actually should have been identified as normal count range (0-4095).

Input Range (V): 0-10; EU Range: 120 - 9200F Expected Value: 20% = 280; SV = 520 Observed Value: 20% SV T9012 119 419 T9013 120 420 - These would be expected values using a narrow count range to convert counts obtained from specified inputs.

This is listed as Discrepancies 8,10,12 and 13 in Test Log entries 31, 33, 40 and 41.

ATTACHMENT 2

6. There was one ' data point (F9009, Point No.101) which was assigned an address in the SPDS Signal List which was different from actual address as installed.

This is identified as Discrepancy 16 in Test Log entry 64.

7. There was one digital data point (Z9974, SFV-53616, Point No. 256) which did not respond to signal . input at specified address. Testing revealed contact position in data word was one bit off in program.

This is identified as Discrepancy 18 in Test Log entry 75.

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