ML20204H441
| ML20204H441 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 11/06/1984 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| GL-84-15, NUDOCS 8411120292 | |
| Download: ML20204H441 (17) | |
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INM Ehrt D.Weers Vce Presdent November 6, 1984 Trojan Nuclear Plant Docket 50-344 License MPF-1 Mr. Darrell G. Eisenhut, Pirector Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear. Regulatory Conunission Washington DC 20555
Dear Sir:
Response to Generic Letter 84-15 Diesel Generator Reliability As required by NRC letter dated July 2, 1984 (Generic Letter 84-15), PGE is responding to year request for information as indicated below.
1.
NRC Request:
Reduction in Number of Cold Fast Start Surveillance Tests for Diesg Generators This item is directed toward reducing the number of cold fast start surveillance tests for diesel generators which the staff har determined results in premature diesel engine degradation. The details relating to this subject are provided in Enclosure 1.
Licensees are requested to describe their current programs to avoid cold fast start-surveillance testing or their intended actions to reduce cold fas'c start surveillance testing for diesel generators.
PGE Response:
The PGE response to this issue was provided by our February 14, 1984 letter responding to NRC Generic Letter 83-41.
The emergency diesel generators at the Trojan Nuclear Plant are not subjected to cold fast starts.
2.
NRC Request:
Diesel Generator Reliability Data This item requests licensees to furnish the current reliability of each diesel generator at their plant (s), based on surveillance test data.
I Licensees are requested to provide the information requested in.
8411120292 841106 PDR ADOCK 05000344 PDR p
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W M M C0tT4)EN1y Mr. Darrell C. Eisenhut, Director November 6, 1984 Page 2 PGE Response:
The PGE response to this issue is provided in Attachment A.
- 3..ERC Request:
Diesel Generator Reliability Licensees are requested to describe their program, if any, for attaining and maintaining a reliability goal for their diesel generators. An example of a performance Technical Specification to support a desired diesel generator reliability goal has been provided by the staff in Enclosure 3.
Licensees are requested to comument on and compare their existing program or any proposed program with the example performance specificatlon.
PGE Response:
4 i
Presently, PGE does not have a diesel generator reliability program per se.
However, PGE has taken steps such as modifying the lube oil soakback pump to enhance diesel generator reliability.
Based on a recent diesel generator failure to start, a program to track and, if'needed, enhance diesel generator. reliability is under consideration. This program is in the preliminary stages and a detailed synopsis cannot yet be provided. However, the following are comments on the example program (Technical Specifications) given in to Generic Letter 84-15.
a.
The proposed program uses as a base the "last 100 valid demands" to determine diesel generator reliability. Based on the review performed for 2 above, this.is considered an excessively long time I'
frame to characterize the current reliability for the diesel generator.
Toget100"valN" demands,thereviewhadtoconsiderdiesel starts that occurred more than 4 years ago. Considering how rapidly such things as the quality of maintenance, operator proficiency, etc, can change, it is felt that the previous i
100 valid demands creates too long a time frame to give a realistic L
indication for the current reliability of the diesel generator. It f-
'is postulated that the last 50 demands or all demands within the l
last 24 months would provide a more realistic indication of the current diesel generator reliability. PGE realizes that statistically, a smaller sample will reduce the confidence level.
~.
W Gewierd BectricCorigxsiy Mr. Darrell G. Eisenhut, Director November 6, 1984 Page 3 b.
The proposed program does not take into account any physical
~
changes made to the diesel generator or its maintenance programs that would affect its reliability.
For example, if 3 of the last 5 trips were caused by clogged fuel oil Y-strainers, and larger capacity strainers are installed and/or the frequency for strainer cleaning has been increased, the problem has been effectively cured. The previous trips caused by clogged Y-strainers statistically do not apply to the current diesel generator reliability because the situation has changed such that the cause of the 3 trips no longer exists. Therefore, these 3 trips should be deleted from any statistical base used to pet, vide
-an indication of current diesel generator reliability. The proposed program has no allowance to enable it to respond to I
changing conditions.
PGE agrees that reliability of emergency power sources is an important part of ensuring Plant safety. However, PGE considers the proposed program
~ inappropriate to do this.
Of special concern is the increased surveillance activities required by the program if a certain number of diesel generator failures occur. To test the diesel generator per the proposed program, the generator must be-synchronized and loaded on its ESF bus. To do this, the diesel generator j
would either have to run paralleled to offsite power or carry the ESF bus by itself if sufficient load exists on the ESF bus to meet the test requirements. If run in parallel with offsite power, the possibtlity exists for.an electrical transient-causing a loss of both the offsite power and the diesel generator and thereby increasing the chances for a station blackout. A switching error in either case could cause a severe electrical and plant transient due to the high probability of de-energizing the ESF bus.
Based upon the above discussion, PGs considers it inappropriate to institute a program that can increase the number of times the diesel l_
generators are required to be loaded during power operation. It is thought that the abovi discussion is also one reason that the present W-STE requirements state that with degraded AC power sources in Modes 1, 2, 3, or l
4 (Specification 3.8.1.1) the diesel generator (s) are only required to be 1-started (and not loaded) to verify operability.
L b
.As stated previously, details on PGs's Plant reliability program cannot be L
provided because the program is still under consideration. However, based l
on the review of the Generic Letter C4-15 proposed program, a general outline of a reliability program can be made.
i i
Pbethuld W M Coiiiproiny Mr. Darrell G. Eisenhut, Director November 6, 1984 Page 4 The program will not require added load testing of the diesel generators.
1 I
Additional testing in itself does nothing to increase (or correct) actual diesel generator reliability.
Instead, the progran will focus on the cause of failures such as inadequate training, inadequate guidance or procedures, and equipment malfunctions or failures. The program will directly track the cause of diesel generator failures and, if trends exist, would direct effective corrective actions to be performed. Tracking of diesel generator reliability would be performed, but it will be used as a management tool to ensure that effective maintenance and upkeep of the diesel generatora is performed instead of as a regulatory limit (Technical Specification). The reliability will be based on failure to start and failure to load criteria as outlined in Attachment A, Section 2.b in an attempt to make the data more accurately reflect actual diesel generator availability. This method of generating data would help to ensure that operators do not unnecessarily load and run diesel generators just to ensure that " good" starts (EDG started but not loaded) are not left out of the data base (as would occur in the proposed program).
PGE expects to have a Maintenance and Reliability Engineering Program implemented by December 1985.
Sincerely, Bart D. Withers Vice President Nuclear i
c:
Mr. Lynn Frank, Director State of Oregon Department of Energy Mr. John B. Hartin Regional Administrator, Region V U.S. Nuclear Regulatory Commission Subscribed and sworn to before me this 6th day of November 1984.
M_
9MyCommissionE Ml b
Notary Public of Qfegon hs#[
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Trojan Nuclear Plant Mr. Darrell G. Eisenhut Docket 50-344 Att 44.tunent A License WPF-1 Page 1 of 13 DIESEL GENERATOR RELIABILITY DATA As requested in Enclosura 2 to Generic Letter 84-15, the following t
information is provided, 1.
PGE has adopted the policy that Regulatory Guide 1.108,.Rev. 1, Periodic Testing of Diesel Generator Units, which was issued after receipt of the Trojan FOL (WPF-1), is not applicable. Therefore, PGE
'does not presently maintain a record Which iteinises the demands and failures experienced by each emergency diesel generator (EDG), nor is a yearly data report maintained for the EDGs per the Regulatory Guide.
2.
A review of the control room logs and Periodic Operating Test records was performed to gather the requested data for the last 20 and 100 valid demands. Per Enclosure 2 to Generic Letter 84-15, the criteria used to determine valid demands and failures was Regulatory Guide 1.108. Position C.2.e.
During this review, several probleins arose relating to the criteria used to determine a valid demand.
These problems are as follows:
Regulatory Guide 1.108. Position G.2.s(3) gives the criteria for a.
classifying EDG operation as a valid success. To be valid, the EDG aust operate for a minimum of one hour at 1 0 percent of 5
continuous rated load (per Updated FSAR Page 8.3-22, the EDG continuous rating is 4418 m).
A problem arises since Trojan Technical Specification 4.8.1.1.2.a.6 (Monthly surveillance) requires that the EDG be loaded to only 11690 m (1682 EW prior to Amendment 89).
Since this monthly surveillance is by far the major EDG operation at load, excluding this data would make it nerely impossible to gather the requested data for loaded EDG operation. Therefore, the criteria for valid diesel load was changed to 11690 EW for this review instead of 150 percent of 4418 EW.
i b.
During the review of the control room logs and test records, a
-concern was raised about the number of successful EDG starts and runs that were excluded because they did not meet the criteria of Regulatory Guide 1.108 (as modified in "a" above). Using this criteria, the review showed that approximately 244 successful starts and operation of the West EDG and approximately 199 successful starts and operation of the East EDC had to be excluded.
Due to the method chosen to determine EDG reliability, numerous successful operations of the EDGs have been excluded. For example, after repair or maintenance to the air start motors, the EDG would be started to verify operability. Since loaded EDG
=
l Mr. Darrell G. Eisenhut Trojan Euclear Plant Attactunent A Docket 50-344 Page 2 of 13
. License EFF-1 operation does nothing to verify satisfactory air start noter repairs, the EDG would be started, shutdown, declared operable, and not load tested until the next required surveillance.
Because the EDG was not loaded, the above test is not a valid successful test When determining EDG reliability even though it was sufficient to declare the EDG operable. However, had the test been unsuccessful, the test would have been put into the reliability data as a failure. This significantly skews the indicated reliability of the EDGs to show the EDCs as being less reliable than they truly are. This is of special concern because EUREG CR-0660 (Enhancement of Onsite Emergency Diesel Generator Reliability) chowed that most failures were failure to start, not failure to carry load. The concern is that this skewed indica-tion of EDG reliability will cause an erroneous resolution to Unresolved Safety Issue A-44, Station Blac.kout.
It is suggested that instead of the Generic Letter 84-15 method of determining EDG reliability, a two step process be used. The first step is to list all attempted starts and failures to start. Then from this list determine how many attempts were made to load the diesel. The overall EDG reliability would then be calculated as follows:
Attempts to Load - Failures to load 1 Attempts to Start - Fs11ures to Start Attempts to Load Attempts to Start This method uses the actual reliability of the EDG to accept load to determine how many failures would have occurred if loading had been attempted for EDG starts wnere load was not actually applied. As an example, consider the following.
l Valid Attempts to start = 344 l
Valid Failures to start =
4 l
Valid Attempts to load = 146 (assume all successful runs meet a minimum time to run) lA Valid Failures to load 5
=
Using the criteria of Generic Letter SA-15, the RDG reliability for the last " valid" 100 starts and operations would be:
100 - (5 + 4) or,91 Valid tests - A A failures or Valid teats 100 l
If the method outlined above is used the reliability is:
(146 - 5)(344-4) or.95 (146)
(344)
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Trojan Euclear Plant Mr. Darcell C. Eisenhut Docket 50-344 Attachment A License EFF-1 Page 3 of 13 As can be seen, the exclusion of approximately 244 successful EDG starts significantly skews the results to show an abnormally low EDG reliability. PGE feels that the above example is particularly significant since the numbers used above are for our West EDG.
The East EDC shows similar results of.95 reliability vice.90 reliability per the Generic Letter 84-15 criteria.
We realize the above does not cover all the different types of EDG operation (ie, what if the EDG is only loaded for 3 minutes).
However, this has been included to point out that significant skewing of the results can occur due to the method chosen to determine what is and is not a successful _ test. Additionally, the present Regulatory Guide 1.108 criteria may cause operators to unnecessarily load and run an EDG for 21 hr to be able to take credit for a successful EDG start. This additional EDG and switchgear operation may actually cause a decrease in EDG reliability due to added wear, and has the possibility of increasing Plant transients and safety system challenges due to switching errors or switchgear failures. Based on the above, PGE strongly recossends that the present Regulatory Guide 1.108 criteria be reviewed to determine if a more realistic method of calculating EDG reliability can be used.
The EDG data requested in Generic Letter 84-15 Enclosure 2, is shown on the following pages. As outlined in Item 1 above, Esgulatory Guide 1.108 records are not maintained by PGE.
Therefore, this data had to be con-structed from logs and test records. In certs.in instances, interpreta-tions had to be made when classifying an EDG operation as valid or 1avalid based on Plant conditions and/or evolutions in progress.
EDTE: Since the Trojan EDG crankcase overpressure trip was not bypassed during previous emergency starts, these results include failures due to this trip. However, this trip is now bypassed. To obtain the indicated reliability for the diesel generators as they exist today, these failures should be deleted. This removes two failures for the West EDG and three failures for the East EDG over the last 100 valid operations.
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Att chment A P 39 4 of 13 West EDG Reliability Data Date Comments 09/28/84 POT-12-1-A.
VALID run (1).
09/23/84 POT-12-1-A.
VALID run (2).
09/21/84 May have been for maintenance. Cannot verify, therefore failure on crankcase pressure trip. VALID failure (3).
09/20/84 Crankcase pressure trip. VALID failure (4).
08/31/84 POT-12-1-A.
VALID run (5).
08/30/84 POT-12-2.
EDG tripped, no cause stated. VALID failure (6).
08/19/84 POT-12-1-A.
VALID run (7).
07/24/84 POT-12-1-A.
VALID run (8).
- 07/24/84 POT-12-1-A.
Manually secured, no reason stated, probably crankcase pressure Per 1700 entry stating vacuum is overspec. Since no reason stated, trip will be considered a VALID failure (9).
05/11/84 POT-12-1-A.
VALID run (10).
04/17/84 POT-12-1-A.
VALID run (11).
04/16/84 POT-12-1-A.
VALID run (12).
04/13/84 POT-12-1-DA.
VALID run (13).
. 03/16/84 POT-12-1.
VALID run (14).
02/16/84
-POT-12-1.
VALID run (15).
I 01/20/84 POT-12-1-A.
VALID run (16).
l 12/23/83 POT-12-1-A.
VALID run (17).
11/25/83 POT-12-1-A.
VALID run (18).
11/01/83 POT-12-1-A.
VALID run (19).
10/28/83 POT-12-1.
VALID run (20).
10/20/83 POT-12-1.
VALID run (21).
09/30/83 POT-12-1.
VALID run (22).
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e t-mtw--vrw
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=-----w--~s---
w-
-w
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Atttchment A Pr43 5 cf 13 West EDG Reliability Data 4
Data Comuments i
09/16/83 POT-12-1-A.
VALID run (23).
09/16/83 Failed field flashing relays. VALID failure (24).
09/02/83 POT-12-1-DA.
VALID run (25).
1 08/17/83 POT-12-1-A.
VALID run (26).
08/05/83 POT-12-1-A.
VALID run (27).
08/02/83 POT-12-1-A.
VALID run (28).
07/19/83 Tripped at 900 rpm When idle started. No reason given for running. Based on previous starts this day, it was probably for maintenance testing; however, since it can't be verified as troubleshooting, it is considered a VALID failure (29).
07/07/83 POT-12-1-A.
VALID run (30).
06/10/83 POT-12-1-A.
VALID run (31).
06/10/83 Field current excessive. VALID failure (32).
I' 05/13/83' POT-12-1.
VALID run (33).
05/02/83 POT-12-1-A.
VALID run (34).
04/20/83 No reason given. Probably POT-12-1-A rerun after completion of injector adjustments. VALID run (35).
04/15/83 POT-12-1-A.
VALID run (36).
04/14/83 No reason given. Leak on water expansion tank found and
~ EDG shut down. Consider a VALID failure (37).
03/18/83 POT-12-1-A.
VALID run (38).
02/18/83 POT-12-1-DA.
VALID run (39).
01/21/83 POT-12-1.
VALID run (40).
01/11/83 POT-12-1.
VALID run (41).
12/23/82 POT-12-1.
VALID run (42).
12/17/82 POT-12-1-A.
VALID run (43).
l e-w, se e e m.
.s
~
Attcchunent A P go 6 af 13 West EDG Reliability Data Cosaments Date 12/16/82 POT-12-1.
VALID run (44).
~ 12/15/82 POT-12-1.
VALID run (45).
11/26/82 POT-12-1. VALID run (46).
10/29/82 POT-12-1-A.
VALID run (47).
10/01/82 POT-12-1-A.
VALID run (48).
09/03/82 POT-12-1-A.
VALID run (49).
08/06/82 POT-12-1-A.
VALID RUM (50).
07/08/82 POT-12-1-A.
VALID run (51).
06/15/82-POT-12-1-A.
VALID run (52).
05/14/82 POT-12-1-A.
VALID run (53).
04/16/82 POT-12-1-DA. VALID run (54).
03/19/82 POT-12-1.
VALID run (55).
02/19/82 POT-12-1-A.
VALID run (56).
12/25/81 POT-12-1-DA.
VALID run (57).
12/08/81 POT-12-1-DA.
VALID run (58).
POT-12-1-DA. - VALID run (59).
11/27/81
~
10/30/81 POT-12-3-D1.
VALID run (60).
p 10/02/81 POT-12-1-DA.
VALID run (61).
09/04/81 POT-12-1-D1/DA. VALID run (62).
08/07/81 POT-12-3-D1/DA. VALID run (63).
POT-12-1-D1/DA. -VALID run (64).
07/10/81 06/11/81 POT-12-1-D1/DA. VALID run (65).
05/29/81 POT-12-3-D1/DA. VALID run (66).
04/17/81 POT-12-1-DA.
VALID run (67).
"w e
q
t Attcchment A Pcgo 7 of 13 West EDG Reliability Data Date Comments 03/20/81 POT-12-1-D&.
VALID run (68).
- 02/2n#81 POT-12-1-D1/DA. VALID run (69).
01/23/81 POT-12-1.
VALID run (70).
12/17/80-POT-12-1.
VALID run (71).
11/28/80 POT-12-1-DA.
VALID run (72).
11/04/80 POT-12-1-D1/DA. VALID run (73).
10/30/80 POT-12-1-DA.
VALID run (74).
10/03/80 POT-12-1-DA.
VALID run (75).
09/05/80 POT-12-1-DA.
VALID run (76).
08/08/80 POT-12-1-DA.
VALID run (77).
07/11/80 POT-12-1-D1/DA. VALID run (78).
06/21/80 POT-12-1-DA sad SPT No. 54.
VALID run (79).
I 06/20/80 Governor limit switch failed (after POT completed) Juring SPT No. 54 extended run. VALID failure (80).
06/20/80 started for POT-12-1-D1 (completed SAT) and SPT No. 54.
VALID.run (81).
+
05/16/80 POT-12-1-DA.
VALID run (82).
04/19/80 POT-12-1-D1.
VALID run (83).
04/18/80 POT-12-1-D1/DA. VALID run (84).
03/21/80 POT-12-1-DA.
VALID run (85).
02/22/80 POT-12-1-DA.
VALID run (86).
01/24/80 POT-12-1.
VALID run (87).
12/28/79 POT-11-1-DA.
VALID run (88).
12/18/79
' POT-12-1-DA.
VALID run (89).
11/30/79 POT-12-1-DA.
VALID run (90).
a 4
e w-
--w
---y---
wme-m-w-i www w-wv71----
--,ww-ev----w,vw-,----e pus-y-v-9---pw*-e-
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1
Attcclument A Pago 8 cf 13 West EDC Reliability Data Data Comunents 11/01/79 POT-12-1-DA.
VALID run (91).
10/05/79 POT-12-1-DA.
VALID run (92).
09/07/79 POT-12-1-DA.
VALID run (93).
08/10/79 POT-12-11. VALID run (94).
07/13/79 POT-12-1-DA.
VALID run (95).
06/15/79 POT-12-1.
VALID run (96).
06/08/79 POT-12-1-DA.
VALID run (97).
05/18/79 POT-12-1-DA.
VALID run (98).
04/19/79 POT-12-1-DA.
VALID run (99).
03/23/79 POT-12-1-D1/DA. VALID run (100).
02/23/79 POT-12-1-DA.
VALID run (101).
01/26/79 POT-12-1-D1/DA. VALID run (102).
l MAP /3amh 9704G.1084 i
Att0ctament A Pass 9 cf 13 Best BDG Beliability Data Comments Date 09/23/84 POT-12-1-B.
VALID run (1).
09/14/84 POT-12-1-B.
VALID run (2).
-08/17/84 POT-12-1-B.
VALID run (3).
07/30/84 POT-12-1-B.
VALID run (4).
07/20/84 POT-12-1-B.
VALID run (5).
06/22/84 POT-12-1-B.
VALID run (6).
05/25/84 POT-12-1-B.
VALID run (7).
05/19/84 POT-12-1-B.
VALID BUN (8).
04/27/84 POT-12-1.
VALID run (9).
03/30/84 POT-12-1.
VALID run (10).
03/02/84 POT-12-1-B.
VALID run (11).
02/03/84 POT-12-1-DB.
VALID run (12).
01/06/84 POT-12-1.
VALID run (13).
12/27/83 POT-12-1-B.
VALID run (14).
12/09/83 POT-12-1-B.
VALID run (15).
11/11/83 POT-12-1-B.
VALID BUN (16).
10/19/83 POT-12-1.
VALID run (17).
10/19/83 High crankcase Pressure trip. VALID fallure (18).
10/14/83 POT-12-1.
VALID run (19).
10/11/83 POT-12-1-B.
VALID run (20).
10/04/83 POT-12-1-DB.
VALID run (21).
10/04/d3 Attempted to run POT-12-1.
High 6P in room caused test to be secured. Found blank flanges on ducting. Will consider a VALID failure (22).
10/03/83 POT-12-1.
VALID run (23).
09/20/83 POT-12-1-B.
VALID run (24).
.. ~ ~ ~ ~
-,J
9 ~
Attechnent &
Pago 10 of 13 East EDG Reliability Data Comments
-Date 08/30/83 POT-12-1-B.
VALID run (25).
Found blown seal on water pump at Started on Ex trip.
Consider a VALID failure (26)
~ 08/27/83 1740 (Diesel 8/D at 1650).
r since leak rate is unknown, 08/20/83 POT-12.1-B.
VALID run (27).
VALID No reason given. Trip on high crankcase pressure.
08/19/83 failure (28).
07/22/83 POT-12-1-B.
VALID run (29).
07/03/83 POT-12-1-B.
VALID run (30).
VALID failure High crankcase pressure trip.
07/02/83 POT-12-1.
(31).
04/29/83 POT 12-1.
VALID run (32).
04/01/83 POT-12-1-5.
VALID run (33).
03/04/83 POT-12-1-B.
VALID run (34).
02/04/83 POT-12-1-B.
VALID run (35).
01/07/83 POT-12-1-B.
VALID run (36).
12/13/92 POT-12-1-B.
VALID run (37).
12/10/82 POT-12-1-B.
VALID run (38).
11/12/82-POT-12-1. VALID run (39).
10/15/82 POT-12-1. VALID run (40).
\\
09/17/82 POT-12-1.
VALID run (41).
08/20/82 POT-12-1. VALID run (42).
08/19/82 No reason given. VALID run (43).
Manual shutdown after high-pitch Whine heard during 08/02/82 VALID failure (44).
start.
07/23/82 POT-12-1. VALID run (45).
t 06/25/82
. POT-12-1. VALID run (46).
Attcchment A P go 11 cf 13 East EDG Reliability Data
__pete _
Comments 06/22/82 POT-12-1.
VALID run (47).
05/28/82 POT-12-1.
VALID run (48).
05/12/82 POT-12-1.
VALID run (49).
05/12/82 POT-12-1.
VALID run (50).
05/06/82 Run for maintenance. VALID run (51).
03/05/82.
POT-12-1.
VALID run (52).
02/24/82 POT-12-3-DB.
VALID run (53).
02/05/82 No reason given. VALID run (54).
01/08/82 POT-12-1-DB.
VALID run (55).
12/11/81 POT-12-1.
VALID run (56).
11/20/81 POT-12-3-DB.
VALID run (57).
11/13/81 No reason given. VALID run (58).
10/16/81 POT-12-1.
VALID run (59).
09/18/81 POT-12-1-DB.
VALID run (60).
.07/24/81 POT-12-1-DB.
VALID run (61).
06/26/81 POT-12-1-DB.
VALID run (62).
06/04/81 50 reason given. VALID run (63).
06/03/81 Various failures listed. No causes given. VALID failure (64).
05/29/81 POT-12-3-DB.
VALID run (65).
05/01/81 POT-12-1.
VALID run (66).
04/15/81 POT-12-1-DB.
VALID run (67).
[
04/03/81 POT-12-1-DB.
VALID run (68).
03/06/81 POT-12-1-DB.
VALID run (69).
02/06/81 POT-12-1-DB.
VALID run (70).
./
Attcetunent A
- /.'
Pago 12 ef 13 East EDG Reliability Data Date Comments
'01/18/81 POT-12-1-DB.
VALID non (71).
'01/14/81 POT-12-1-DB.
VALID run (72).
j
~
01/14/81 POT-12-1-DB.
Maintenance left tools in overspeed trip mechanism. VALID failure (73).
01/14/81 No reason given. VALID run (74).
01/09/81 50 reason given. VALID run (75).
12/12/80 POT-12-1.
VALID run (76).
11/27/80 POT-12-1-DB.
VALID run (77).
11/24/80 POT-12-1-DB.
VALID run (78).
11/14/80 POT-12-1.
VAL 7D run (79).
10/17/80 POT-12-1.
VALID run (80).
09/18/80 POT-12-1-DB.
VALID run (81).
I 08/22/80 POT-12-1-DB.
VALID run (82).
-07/25/80 POT-12-1.
VALID run (83).
06/27/80 POT-12-1-DB.
VALID run (84).
06/21/80 No reason given other than " data collection". VALID run (85).
06/11/80 POT-12-1-DB.
VALID sun (86).
06/07/80 SPT-54. VALID run (87).
05/30/80 POT-12-1-D1/DB. VALID run (88).
05/27/80 POT-12-1-DB.
VALID run (89).
05/24/80 POT-12-1-D1 and SPT-54. VALID BUE (90).
05/24/80 Pire in exhaust stack. VALID failure (91).
05/23/80 Trip on overspeed. VALID failure (92).
04/04/80 POT-12-1-DB.
VALID run (93).
l 03/11/80 POT-12-1-DB.
VALID run (94).
l
l l,
Attactament A Page 13 of 13 East EDC Reliability Data Comments Date 03/07/80 POT-12-1-DB.
VALID run (95).
02/08/80 POT-12-1-DB.
VALID run (96).
01/18/80 POT-12-1.
VALID run (97).
01/11/80 POT-12-1.
VALID run (98).
12/14/79 POT-12-1-DB.
VALID run (99).
11/16/79 POT-12-1-DB.
VALID run (100).
10/25/79 POT-12-1-DB.
VALID run (101).
10/19/79 POT-12-1-DB.
VALID run (102).
09/21/79 POT-12-1-DB.
VALID run (103).
f MAP /3anh 9685C76.1084 5
b e
t t
I 1
4
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_ - _.. -~.... - _.... _ _. _,
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