ML20083C972

Applicant Exhibit A-18,consisting of to NRC Re Clarification of Response to Confirmation of Action Ltr

ML20083C972
Person / Time
Site:	Vogtle
Issue date:	04/17/1995
From:	Hairston W GEORGIA POWER CO.
To:
References
CAL, OLA-3-A-018, OLA-3-A-18, NUDOCS 9505230170
Download: ML20083C972 (5)

Text

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August 30, 1990 geC4,soJFf1CE GF-SECRETARY-W. G Hearsten. lll M & SERVICEI se c. v :c e.c :,- .) BRANCH sciea, coe r: s 4

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NUCLEARREGULATORf ro- v t y- e t.4 -3 b

Docket No. 50-424  % p D eket No. FC'h5-ou -3 0fficial Exh. No, - M in tha rnatter of_ tA4 f4 W :+s ;41 fb 1

U. S. Nuclear Regulatory Connission Staff IDENTIRED v l Region iI Apphcant 7 RECEIVED v.-

101 Marietta Street, N. W. In:crvencr - REJECTED Atlanta, GA 30323 contg 0ffr ATTN: Mr. S. D. Ebneter i contractor DATE o v-t 7 -q s-

Dear Mr. Ebneter:

Other witness Mc %

Reporter 5. 2.' l.,5 k :

V0GTLE ELECTRIC GENERATING PLANT CLARIFICATION OF RESPONSE TO CONFIRMATION OF ACTION LETTER ,

i By letter dated April 9,1990 (ELV-01516), Georgia Power Company (GPC) responded  !

to a Confirmation of Action Letter dated March 23, 1990. In that letter and in our meeting notes, GPC reported that Diesel Generator (DG) 1A had been started 18 times and DG 18 had been started 19 times with no failures or problems between March 20 and April 9, 1990. Similar information was reported in ,

Revision 0 of Licensee Event Report (LER) 50-424/1990-006 dated April 19, 1990 1 (ELV-01545). As reported in our telephone calls to the NRC, we subsequently l discovered that this information was'in error.

l In Revision 1 to LER 50-424/1990-006 dated June 29, 1990 (ELV-01729), GPC attempted to clarify the correct number of DG starts occurring in this time  !

. period by using reilulatory guide terminology (i.e., valid vs. successful starts). This rev< sed LER accurately reports the number of valid DG starts during the period of March 21 through June 7, 1990. However, during a recent NRC inspection it was pointed out that the revised LER did not adequately clarify the numbers in the April 9th letter. )

The confusion in the April 9th letter and the original LER a'ppear to be the result of two factors. First, there was confusion in the distinction between a successful start and a valid test. For the purpose of this. letter, a start was considered successful when the DG was started and either ran or was intention-ally shut down due to testing in progress, as: identified on the attached tables.

Our use of the term " successful" was never intended to imply a " valid successful test"-in the context of Regulatory Guide 1.108. Many start attempts were made to test the DG's IA and IB using applicable operating procedures. These procedures and. data sheets do not contain criteria for determining if a start is successful which resulted in determinations of success which were inconsistent with the above definition. Second, an error was made by the individual who perforined the count of DG starts for the NRC April 9th letter.

9505230170 950417 PDR ADOCK 05000424 1 0 PDR 1

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U. S. Nuclear Regulatory Commission ELV-02059 Page 2 The purpose of this letter is to correct the figures related to the number of DG starts reported in the April 9th letter. Attached are tables 1 and 2 which summarize the DG starts for the period indicated. For DG 1A, there was a total of 31 start attempts and 29 of these attempts were considered successful after the two failures associated with the March 20 event. For DG 18 there was a total of 29 start attempts and 21 of these attempts were considered successful.

Further, for DG 18 there were 12 successful sequential starts.

Sincerely

. . 0A W. G. Hairston, 11 WGH,Ill/NJS/gm Attachments xc: Georaia Power comoany Mr. C. K. McCoy Mr. G. Bockhold, Jr.

Mr. R. M. Odom Mr. P. D. Rushton NORMS U. S. Nuclear Reculatory Commission Document control Desk Mr. T. A. Reed, Licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident inspector Vogtle 1

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TABLE 1 DIESEL GENERATOR 1A START RUN UNPLANNED L DAII SUCCESS IIM_I TRIP DISCUSSION 139 03-20-90 No 1 min Yes Failure to maintain load.

140 03-20-90 No I min Yes Failure to maintain load.

141 03-20-90 Yes 4 1/2hr No Nanual start, load maintained.

142 03-20-90 Yes 45 min No Normal reserve auxiliary transformer swap method.

143 03-20-90 Yes 5 min No Observation run.

144 03-20-90 Yes 20 min No Observation run.

145 03-23-90 Yes 60 min No Observation run.

146 03-23-90 Yes O min No Started wrong diesel generator.

147 03-29-90 Yes 50 min No UV test start #1.

148 03-30-90 Yes 2 hr Yes* Bubble test #1, high l temperature jacket water '

sensor vented. )

149 03-30-90 Yes 6 min No Trip simulation test. 3 150 03-30-90 Yes 6 min No Trip simulation test.

151 03-30-90 Yes 3 min No Trip simulation test.

152 03-30-90 Yes 6 min No Trip simulation test.

153 03-30-90 Yes 4 min No Orifice modification functional test.

154 03-30-90 Yes 10 min No Orifice modification functional test.

155 03-31-90 Yes 2 min No Drifice modification functional test.

156 03-31-90 Yes 3 min No Orifice modification functional test.

157 03-31-90 Yes 10 min No Bubble test #2 158 03-31-90 Yes 1 min No Sensor trip timing test.

159 03-31-90 Yes 1 min No Sensor trip timing test.

160 03-31-90 Yes 2 min No Sensor trip timing test.

161 03-31-90 Yes 1 min No Sensor trip timing test.

162 03-31-90 Yes 75 min No Sensor trip timing test 163 03-31-90 Yes 27 min No UV test start #2. ,

164 04-01-90 Yes 1 1/2 hr No Normal surveillance test.  ;

165 04-06-90 Yes 1 min No Jacket water temperature test.

166 04-06-90 Yes I min No Jacket water temperature test.

167 04-06-90 Yes 10 min No Jacket water temperature test.

7 TABLEI(CONTINUED)

O!ESEL GENERATOR 1A START RUN UNPLANNED thL._, QA.Il SUCCESS IJE TRIP DISCUSSION 168 04-06-90 Yes 2 1/2 hr No LOSP trip modification functional test.

169 04-09-90 Yes 1 3/4 hr No Normal surveillance test.

• Unit tripped during bubble testing due to one sensor venting and another sensing line being disconnected for testing. This is further described in NUREG-1410.

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TABLE 2 DIESEL GENERATOR 18

- START RUN UNPLANNED L Q81[ SUCCESS l(( TRIP DISCUSSION 120 03-21-90 No 0 min No Post-maintenance run, prime fuel lines, 121 03-21-90 No 0 min No Post-maintenance run, prime fuel lines. 122 03-21-90 No 15 min No Post-maintenance run, adjust governor. 123 03-21-90 No 2 min No Post-maintenance run, fuel oil delta pressure high. 124 03-21-90 No 4 min No Functional test run, fuel oil delta pressure high. 125 03-22-90 Yes 6 min No Functional test for maintenance. 126 03-22-90 Yes 1 min No Functional test for maintenance. 127 03-22-90 Yes 15 min No Post-maintenance overspeed test. 128 03-22-90 Yes 3 min No Post-maintenance overspeed test. 129 03-22-90 Yes 5 min No Post-maintenance overspeed test. 130 03-22-90 Yes 5 min No Voltage clamp circuit adjust. 131 03-22-90 Yes 2 min No Voltage clamp circuit adjust. 132 03-22-90 No 1 1/2 hr Yes Post-maintenance load test, high temperature lube oil trip. 133 03-23-90 Yes 7 hr No Post-maintenance load test 134 03-23-90 No 3 min Yes Post-maintenance load test, low pressure jacket water trip. 135 03-23-90 Yes 4 1/2 hr No Post-maintenance load test. 136 03-24-90 No* 33 min No Post-maintenance load test, high temperature jacket water alarm. 137 03-27-90 Yes 1 1/2 hr No Bubble test. 138 03-27-90 Yes 42 min No Trip simulation test. 139 03-27-90 Yes 3 min No Trip simulation test. 140 03-27-90 Yes 2 min No Trip simulation test. 141 03-27-90 Yes 6 min No Trip simulation test.' 142 03-27-90 Yes 57 min No UV test. 143 03-28-90 Yes 1 3/4 hr No Normal surveillance 144 03-28-90 Yes 4 min No Low pressure lobe oil i modification functional test. 145 03-28-90 Yes 4 min No Low pressure lube oil modification functional test. 146 04-04-90 Yes 1 1/4 hr No Post-maintenance load test. 147 04-05-90 Yes 5 min No LOSP trip modification functional test. 148 04-05-90 Yes 2 hr No Normal surveillance.

• High temperature jacket water trip alam was received and the engine kept >

running.

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