ML13310B265
| ML13310B265 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/29/1984 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8403020275 | |
| Download: ML13310B265 (10) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 M.O. MEDFORD TELEPHONE MANAGER, NUCLEAR LICENSING February 29, 1984 213) 5721749 Director, Office of Nuclear Reactor Regulation Attention: D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
Subject:
Docket No. 50-206 NRC's Request for Additional Information Transamerica Delaval Emergency Diesel Generators San Onofre Nuclear Generating Station Unit 1
References:
- 1. Letter D. M. Crutchfield (NRC) to K. P. Baskin (SCE), dated January 6, 1984, above subject
- 2. Letter R. W. Krieger (SCE) to Attention: D. M. Crutchfield (NRC), dated February 7, 1984, above subject Reference 1 requested information from Southern California Edison Company regarding the Transamerica Delaval emergency diesel generators at San Onofre Unit 1. This information was to consist of responses to seven (7) reliability survey questions and a schedule for responding to seventeen (17) additional questions, and was to be provided within 30 days of receipt of your letter. By Reference 2, we advised you that an extension of time was required until February 29, 1984 for providing our response to Reference 1.
This letter is to close the above commitment. Enclosures 1 and 2 to this letter contain the necessary responses to the NRC's reliability survey questions. As pointed out in Enclosure 1, the period covered is from initial diesel generator startup and operation in early 1977 to the end of 1983. We anticipate that responses to the NRC's "Request for Additional Information" will be submitted by August 1, 1984. This schedule will permit organizations outside Southern California Edison Company who have information relating to the diesel generators to be contacted and the necessary information obtained.
Should you have any questions, please contact me.
Very truly yours, 9040229 30R00 50CI 500020 Enclosures cc:
USNRC Document Control Desk, Washington, D.C.
A. E. Chaffee (USNRC Resident Inspector Units 1, 2 and 3)
II
ENCLOSURE 1 TOI EDG RELIABILITY SURVEY QUESTIONS SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 1 (Period covered is from initial diesel generator startup and operation to end of 1983)
QUESTION
RESPONSE
- 1. Number of failures to start on Diesel Generator #1:
Five failures to start demand and number of failures or run.
(See Enclosure to run (i.e., achieve equilib-2 for details) rium under rated speed, volt age and load conditions).
Diesel Generator #2:
Three failures to start or run.
(See Enclosure 2 for details)
- 2. Total number of demands made Diesel Generator #1:
Total of three hundred leading to either a successful and fifty nine demands.
startup and run or to a failure, (See Enclosure 2 for and when (date) the tests were annual breakdown.)
run.
Diesel Generator #2:
Total of three hundred and sixty four demands.
(See Enclosure 2 for annual breakdown.)
- 3. The time interval between the Diesel Generator 31 days for periodic periodic tests of the DG's.
No's. 1 and 2:
operability test per Technical Specifications.
- 4. Information on the number of Diesel Generator No failures were found times diesel generators were No's. 1 and 2:
other than by testing.
found in a failed state by means other than testing (e.g.,
visual inspection), and the nature of such failures.
- 5. If any failures were censored Diesel Generator Events described in from the data base, complete No's. 1 and 2:
Licensee Event Reports information on these failures submitted during the should be provided.
period under review are not considered failures if those events are not included in Enclosure
- 2. The startup problems summarized in response to Question No. 7 below are not considered failures and are not included in or.
-2 QUESTION
RESPONSE
- 6. Information on failure causes Information on failure causes and fixes for and fixes (in terms of changes diesel generators #1 and 2 is provided in in manufacturing, design,.
procedures or training) and on the specific model of Both diesel generators are Transamerica Delaval DG.
Delaval Model DSRV-20-4 machines.
- 7. Information on how many failures SCE records on factory tests of diesel occurred during pre-operation generators #1 and 2 do not show any evidence and how many after operation of failure.
started.
During startup testing in the field a number of problems were encountered, and corrected by standard methods:
test procedure revision, change to acceptance criteria, adjustment in hardware, or acceptance of problem as is. However, none of the problems is considered of such nature as to be characterized as a diesel generator failure.
For post-operational information, see responses to Questions 1 and 2 above.
IAA:1004F:2605u
ENCLOSURE 2 DIESEL GENERATORS 1 AND 2 OPERATIONAL HISTORY BY YEAR NUMBER OF DATE YEAR TYPE OF TEST DG#
STARTS PROBLEMS/FAILURES OCCURRED REPAIR/MODIFICATION 1977 Load Test 1
11 2
9 Operability Test 1
37 2
47 Refueling Interval Test* 1 2
TOTAL 1
48 2
56 1978 Load Test 1
19 DG 1 Failed to start, stuck 03/28/78 Lubricate fuel rack.
2 14 fuel rack linkage.
Operability Test 1
25 DG 1 Same as dbove.
07/18/78 Lubricate fuel rack and modify 2
31 procedures to require exercising the fuel racks daily and additiona analysis of fuel oil samples.
Refueling Interval Test* 1 3
2 3
TOTAL 1
47 2
48 1979 Load Test 1
19 DG 2 Loose wires on 05/10/79 Reterminate wire, replace relay.
2 20 voltage regulator.
Operability Test 1
30 2
30 TOTAL 1
49 2
50 1980 Load Test 1
14 2
17 Operability Test 1
28 2
22 Refueling Interval Test* 1 5
2 3
Loss of Bus Test 1
2 2
3 TOTAL 1
49 9
45
NUMBER OF DATE YEAR TYPE OF TEST DG#
STARTS PROBLEMS/FAILURES OCCURRED REPAIR/MODIFICATION 1981 Load Test 1
10 DG 1 Lube oil fire due to 07/14/81 2
13 failure of instrument line (not a "failure to start").
Operability Test 1
32 DG 1 Overspeed - low oil 11/19/81 Fill governor with oil, modify 2
40 level in governor.
procedures to require that the oil level be maintained at or near the top of the sight glass.
Loss of Bus Start 1
8 2
5 TOTAL 1
50 2
58 1982 Load Test 1
10 DG 2 Tripped on overspeed; 11/02/82 Replace rack cylinder and modify 2
17 governor rack cylinder Preventive Maintenance Program worn.
to replace cylinder every other refueling outage.
Operability Test 1
22 DG 1 Unstable speed, 11/17/82 Replace governor.
2 17 faulty governor.
Loss of Bus Start 1
7 DG 2 Excitation spiking.
12/07/82 Replace governor and voltage 2
11 regulator.
TOTAL 1
39 2
45 1983 Load Test 1
18 DG 1 Circuit breakers 02/23/83 Replace lightbulb with bulb of 2
16 in control circuit tripped, correct rating.
Operability Test 1
38 due to short circuit 2
30 across a lightbulb in Loss of Bus Start 1
21 local control panel, 2
16 preventing automatic TOTAL 1
77 loading 2
62 IAA:1028F:2605u
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 M.O. MEDFORD TELEPHONE MANAGER. NUCLEAR LICENSING February 29, 1984 (213) 572-1749 Director, Office of Nuclear Reactor Regulation Attention:
D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
Subject:
Docket NRC's KqeS TR0tonal Information Transamerica Delaval Emergency Diesel Generators San Onofre Nuclear Generating Station Unit 1
References:
- 1. Letter D. M. Crutchfield (NRC) to K. P. Baskin (SCE), dated January 6, 1984, above subject
- 2. Letter R. W. Krieger (SCE) to Attention: 0. M. Crutchfield (NRC), dated February 7, 1984, above subject Reference 1 requested information from Southern California Edison Company regarding the Transamerica Delaval emergency diesel generators at San Onofre Unit 1. This information was to consist of responses to seven (7) reliability survey questions and a schedule for responding to seventeen (17) additional questions, and was to be provided within 30 days of receipt of your letter. By Reference 2, we advised you that an extension of time was required until February 29, 1984 for providing our response to Reference 1.
I This letter is to close the above commitment. Enclosures 1 and 2 to this letter contain the necessary responses to the NRC's reliability survey questions. As pointed out in Enclosure 1, the period covered is from initial diesel generator startup and operation in early 1977 to the end of 1983. We anticipate that responses to the NRC's "Request for Additional Information" will be submitted by August 1, 1984. This schedule will permit organizations outside Southern California Edison Company who have information relating to the diesel generators to be contacted and the necessary information obtained.
Should you have any questions, please contact me.
Very truly yours, Enclosures cc:
USNRC Document Control Desk, Washington, D.C.
A. E. Chaffee (USNRC Resident Inspector Units 1, 2 and 3)
ENCLOSURE 1 TDI EDG RELIABILITY SURVEY QUESTIONS SAN DNOFRE NUCLEAR GENERATING STATION, UNIT 1 (Period covered is from initial diesel generator startup and operation to end of 1983)
QUESTION
RESPONSE
- 1. Number of failures to start on Diesel Generator #1:
Five failures to start demand and number of failures or run.
(See Enclosure to run (i.e., achieve equilib-2 for details) rium under rated speed, volt age and load conditions).
Diesel Generator #2:
Three failures to start or run.
(See Enclosure 2 for details)
- 2. Total number of demands made Diesel Generator #1:
Total of three hundred leading to either a successful and fifty nine demands.
startup and run or to a failure, (See Enclosure 2 for and when (date) the tests were annual breakdown.)
run.
Diesel Generator #2:
Total of three hundred and sixty four demands.
(See Enclosure 2 for annual breakdown.)
- 3. The time interval between the Diesel Generator 31 days for periodic periodic tests of the DG's.
No's. 1 and 2:
operability test per Technical Specifications.
- 4. Information on the number of Diesel Generator No failures were found times diesel generators were No's. 1 and 2:
other than by testing.
found in a failed state by means other than testing (e.g.,
visual inspection), and the nature of such failures.
- 5. If any failures were censored Diesel Generator Events described in from the data base, complete No's. 1 and 2:
Licensee Event Reports information on these failures submitted during the should be provided.
period under review are not considered failures if those events are not included in Enclosure
- 2. The startup problems summarized in response to Question No. 7 below are not considered failures and are not included in or.
0 0
-2 QUESTION
RESPONSE
- 6. Information on failure causes Information on failure causes and fixes for and fixes (in terms of changes diesel generators #1 and 2 is provided in in manufacturing, design,.
procedures or training) and on the specific model of Both diesel generators are Transamerica Delaval DG.
Delaval Model DSRV-20-4 machines.
- 7. Information on how many failures SCE records on factory tests of diesel occurred during pre-operation generators #1 and 2 do not show any evidence and how many after operation of failure.
started.
During startup testing in the field a number of problems were encountered, and corrected by standard methods:
test procedure revision, change to acceptance criteria, adjustment in hardware, or acceptance of problem as is. However, none of the problems is considered of such nature as to be characterized as a diesel generator failure.
For post-operational information, see responses to Questions 1 and 2 above.
IAA:1004F:2605u
ENCLOSURE 2 DIESEL GENERATORS 1 AND 2 OPERATIONAL HISTORY BY YEAR NUMBER OF DATE YEAR TYPE OF TEST DG#
STARTS PROBLEMS/FAILURES OCCURRED REPAIR/MODIFICATION 1977 Load Test 1
11 2
9 Operability Test 1
37 2
47 Refueling Interval Test* 1 2
TOTAL 1
48 2
56 1978 Load Test 1
19 DG 1 Failed to start, stuck 03/28/78 Lubricate fuel rack.
2 14 fuel rack linkage.
Operability Test 1
25 DG 1 Same as dbove.
07/18/78 Lubricate fuel rack and modify 2
31 procedures to require exercising the fuel racks daily and additiona analysis of fuel oil samples.
Refueling Interval Test* 1 3
2 3
TOTAL 1
47 2
48 1979 Load Test 1
19 DG 2 Loose wires on 05/10/79 Reterminate wire, replace relj.
2 20 voltage regulator.
Operability Test 1
30 2
30 TOTAL 1
49 2
50 1980 Load Test 1
14 2
17 Operability Test 1
28 2
22 Refueling Interval Test* 1 5
2 3
Loss of Bus Test 1
2 2
3 TOTAL 1
49 2
45
-2 NUMBER OF DATE YEAR TYPE OF TEST DG#
STARTS PROBLEMS/FAILURES OCCURRED REPAIR/MODIFICATION 1981 Load Test 1
10 DG 1 Lube oil fire due to 07/14/81 2
13 failure of instrument line (not a "failure to start").
Operability Test 1
low oil 11/19/81 Fill governor with oil, modify 2
40 level in governor.
procedures to require that the oil level be maintained at or near the top of the sight glass.
Loss of Bus Start 1
8 2
5 TOTAL 1
50 2
58 1982 Load Test 1
10 DG 2 Tripped on overspeed; 11/02/82 Replace rack cylinder and modify 2
17 governor rack cylinder Preventive Maintenance Program worn.
to replace cylinder every other refueling outage.
Operability Test 1
22 DG 1 Unstable speed, 11/17/82 Replace governor.
2 17 faulty governor.
Loss of Bus Start 1
7 DG 2 Excitation spiking.
12/07/82 Replace governor and voltage 2
11 regulator.
TOTAL 1
39 2
45 1983 Load Test 1
18 DG 1 Circuit breakers 02/23/83 Replace lightbulb with bulb of 2
16 in control circuit tripped, correct rating.
Operability Test 1
38 due to short circuit 2
30 across a lightbulb in Loss of Bus Start 1
21 local control panel, 2
16 preventing automatic TOTAL 1
77 loading 2
62 IAA:1028F:2605u