ML18361A572
| ML18361A572 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/17/2018 |
| From: | Daugherty J Dominion Energy Nuclear Connecticut |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 18-163 | |
| Download: ML18361A572 (6) | |
Text
Dominion Energy Nuclear Connecticut, Inc.
Rt 156, Rope Ferry Road, Waterford, CT 06385 Dominion Energy.com DEC 1_l 2818 ie Dominion
- ~ Energy U. S. Nuclear Regulatory Commission Serial No.18-163 Attention: Document Control Desk NSS&L/MLC RO Washington, DC 20555 Docket Nos. 50-336/423 License Nos. DPR-65 NPF-49 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNITS 2 AND 3 CHANGES TO ENHANCED SURVEILLANCE PROGRAM MONITORING FREQUENCY FOR LOSS OF FILL-OIL IN TRANSMITTERS MANUFACTURED BY ROSEMOUNT On December 22, 1992, the Nuclear Regulatory Commission (NRG) issued NRC Bulletin 90-01, Supplement 1, "Loss of Fill-Oil in Transmitters Manufactured by Rosemount," to update licensees on actions taken by the NRG in response to a series of Rosemount Model 1153 and Model 1154 transmitter failures caused by a loss of fill-oil. The NRC requested licensees to review the information for applicability to their stations and modify, as appropriate, their actions to address this issue. In letter dated March 4, 1993, Northeast Nuclear Energy Company (NNECO), the former owner of Millstone Power Station Units 2 and 3 (MPS2 and MPS3), responded to NRG Bulletin 90-01, Supplement
- 1. In this response, NNECO identified the Rosemount transmitters installed at MPS2 and MPS3 and the applicable surveillance method and surveillance frequency for each transmitter. Based on use of the enhanced surveillance monitoring program (described in the original NRG Bulletin 90-01, dated March 9, 1990), the specific applications for the transmitters, and the available backup indications, NNECO concluded that replacement of the transmitters provided no measurable gain with respect to nuclear safety.
NRG Bulletin 90-01, Supplement 1, states that for those Rosemount transmitters installed in high pressure (> 1500 psi) systems that have met the Rosemount psi-month threshold criterion, the monitoring frequency may be extended to at least once every refueling frequency (but not exceeding 24 months), provided the monitoring interval is justified based upon transmitter performance and the NRG is provided a copy of the licensee justification to extend the monitoring frequency. For Rosemount transmitters installed in medium press.ure (> 500 psi and ~ 1500 psi) systems that have met the Rosemount psi-month threshold criterion, the monitoring frequency may be discontinued at the licensee's discretion.
A review was recently performed by Dominion Energy Nuclear Connecticut, Inc. (DENG) to determine the status of the installed Rosemount transmitters at MPS2 and MPS3, and to evaluate changes to the monitoring frequency for those Rosemount transmitters that have reached the appropriate psi-month threshold criterion. The current status of the Rosemount transmitters identified in the March 4, 1993 response to the NRG is provided in the attachment to this letter (see "Current Status" column). The table shows that the Rosemount transmitters have either 1) met their psi-month threshold criterion, 2) been replaced, or 3) their system is no longer is use (out of service).
Serial No: 18-163 Docket Nos. 50-336/423 Page 2 of 2 For the Rosemount transmitters still installed in high pressure (> 1500 psi) systems (i.e.,
NRG Bulletin 90-01, Supplement 1, Requested Actions 1a and 1b), the monitoring frequency will be extended to a refueling frequency (see "New Surveillance Frequency" column in the attached table) since the transmitters have reached the appropriate psi-month threshold criterion recommended by Rosemount. The extension of this frequency is justified based on years of satisfactory surveillance performance of the transmitters which provides sufficient evidence of their reliability and ability to perform their specific safety function. DENG will continue to monitor these transmitters using the enhanced surveillance monitoring program at a refueling frequency for the life of the transmitter.
For the Rosemount transmitters still installed in medium pressure (> 500 psi and ~ 1500 psi) systems (i.e., NRG Bulletin 90-01, Supplement 1, Requested Actions 1c and 1d),
monitoring is no longer required since the transmitters have reached the appropriate psi-month threshold criterion recommended by Rosemount. Monitoring for these transmitters will be discontinued.
If you have any questions or require additional information, please contact Mr. Jeffry Langan at (860) 444-5544.
Sincerely, augherty ice President - Millstone
Attachment:
Rosemount Transmitter Status Update Commitments made in this letter: None cc: U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd. Suite 100 King of Prussia, PA 19406-2713 R. V. Guzman Senior Project Manager - Millstone Power Station U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 C2 11555 Rockville Pike Rockville, MD 20852-2738 NRG Senior Resident Inspector Millstone Power Station
Serial No.18-163 Docket Nos. 50-336/423 ATTACHMENT ROSEMOUNT TRANSMITTER STATUS UPDATE MILLSTONE POWER STATION, UNITS 2 AND 3 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.
Serial No.18-163 Docket Nos. 50-336/423 Attachment, Page 1 of 3 Millstone Station Rosemount Transmitters*
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NRC:: ;I
0.(i~inal New Ji"ans'mitter, 'E~nd:icfn,,
- ., Static Surveillance'. ... *\ . ~urveillance, * , 90-01:, Current Si!t:veillance
- Notification,* '
,.: Pressur,~ * ' ' Method, 9ategory Status ,, :
1: ,, ' ' 'Frequency .: :Fr;equ.ency Required?'
" " k 3CHS-FT121 Charging Flow 2250 3 Times/60 days CM*, RC lb TCM Refueling Yes 3CHS-FT142 RCP Seal H20 2250 3 Times/60 days CM*, RC lb TCM Refueling Yes 3CHS-FT143 RCP Seal H20 2250 3 Times/60 days CM*, RC lb Replaced NLR No 3CHS-FT144 RCP Seal H20 2250 3 Times/60 days CM*, RC lb Replaced NLR No 3CHS-FT145 RCP Seal H20 2250 3 Times/60 days CM*, RC lb TCM Refueling Yes 3FWS*LT551 SG LL Trip (RPS) 1000 3 Times/60 days CM le Replaced NLR No 3FWS*LT552 SG LL Trip (RPS) 1000 3 Times/60 days CM le Replaced NLR No 3FWS*LT553 SG LL Trip (RPS) 1000 3 Times/60 days CM le Replaced NLR No 3FWS*LT554 SG LL Trip (RPS) 1000 3 Times/60 days CM le ,, Replaced NLR No TCM 3HVC*PT73A Air Storage 3000 Refueling RC lb NLR No System OOS TCM 3HVC*PT738 Air Storage 3000 Refueling RC lb NLR No System OOS 3MSS*PT514 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT515 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT516 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT524 SG LP Trip (RPS) 1000 3 Times/60 days CM le Replaced NLR No 3MSS*PT525 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT526 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT534 SG LP Trip (RPS) 1000 3 Times/60 days CM le Replaced NLR No 3MSS*PT535 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT536 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT544 SG LP Trip (RPS) 1000 3 Times/60 days CM le - TCM NLR No 3MSS*PT545 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT546 SG LP Trip (RPS) 1000 3 Times/60 days CM le TCM NLR No 3MSS*PT505 Turb 1st Stage 650 3 Times/60 days CM le TCM NLR No 3MSS*PT506 Turb 1st Stage 650 3 Times/60 days CM le TCM NLR No 3RCS*FT414 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT415 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes
- Table does not include low pressure (<100 psi) transmitters identified in NNECO letter 814381, dated March 4, 1993 since monitoring was not required.
(1) NRC notified of refueling calibration frequency in NNECO letter 814359, dated February 2, 1993.
Serial No.18-163 Docket Nos. 50-336/423 Attachment, Page 2 of 3 Millstone Station Rosemount Transmitters*
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C
- Static er.iginal: ** *::', I'* ,
- Nellll ' NRt i
- Sur.v~illance:* 90'-Ql, . Current '
na,fsmitter 'Function . *surv~illance: : Surveillance Notification-
- P.ressure-
- Method *Category: Status ;
,Frequency. " :Frequency Required?
3RCS*FT416 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT424 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la Replaced NLR No 3RCS*FT425 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT426 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT434 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT435 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT436 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT444 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT445 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*FT446 RCS Flow Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*LT460 Pzr Hi Lvl Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*LT461 Pzr Hi Lvl Trip (RPS) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*PT403 RCS WR Pressure 2250 3 Times/60 days CM lb Replaced NLR No 3RCS*PT403A RCS WR Pressure 2250 Refueling RC lb Replaced NLR No 3RCS*PT457 Pzr Press (RPS/ESF) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*PT458 Pzr Press (RPS/ESF) 2250 3 Times/60 days CM la TCM Refueling Yes 3RCS*PT49 RCS Ext Range 2250 Refueling RC,CC lb TCM Refueling Yes 3RCS*PT50 RCS Ext Range 2250 Refueling RC,CC lb TCM Refueling Yes 3SIH-FT917 Chg Pmp Discharge 2250 Refueling RC lb TCM Refueling Not11 3SIL-PT961 SI Tank -A Press 650 Refueling RC 1d Replaced NLR No 3SIL-PT963 SI Tank- 8 Press 650 Refueling RC 1d TCM NLR No 3SIL-PT965 SI Tank - C Press 650 Refueling RC 1d TCM NLR No 3SIL-PT967 SI Tank - D Press 650 Refueling RC 1d TCM NLR No
- *.. ',I* - . .. .-
LT-110X Pzr Level 2250 3 Times/60 days OFIS, RC la Replaced NLR No LT-110Y Pzr Level 2250 3 Times/60 days OFIS, RC la Replaced NLR No
- Table does not include low pressure (<100 psi) transmitters identified in NNECO letter 814381, dated March 4, 1993 since monitoring was not required.
(1) NRC notified of refueling calibration frequency in NNECO letter 814359, dated February 2, 1993.
Serial No.18-163 Docket Nos. 50-336/423 Attachment, Page 3 of 3 Table Key (CC) Channel Checks performed by the Operations Department are conducted periodically. These checks compare the outputs to redundant channels and any loss of oil failures will be readily detected.
(CM) Computerized monitoring system is implemented to track both drift and drift rate. Data will be obtained and analyzed at a frequency of at least three times every 60 days with a 25% tolerance in modes 1 & 2.
(CM*) These five transmitters are monitored by the computer monitoring program, however no redundancy is provided and therefore drift cannot be monitored. The variance of the signal will be monitored by the program at the specified frequency.
(NLR) No Longer Required (NR) These transmitters with low operating pressures (<500psi) were formally included in an enhanced surveillance program. Under NRCB 90-01 Supplement 1 the enhanced surveillance program is no longer necessary. (Note: these are not included in the updated table shown above).
(OFIS) Millstone Unit 2 has two Rosemount transmitters installed (LT-110x and LT110y) used to monitor pressurizer level. These transmitters will be monitored at a minimum frequency of 3 times/60 days using Offsite Facility Information System (OFIS). Utilizing data from OFIS, a loss of oil from these transmitters will be detected prior to actual failure.
(OOS) Out of Service (RC) Normal refueling calibration, in accordance with Rosemount recommendations for loss of oil fill situations, with cumulative drift monitored and recorded. This applies only to those transmitters not monitored for drift by the computer monitoring program.
(Refueling) Calibration to be done at least every refueling cycle but not to exceed 24 months.
(TCM) Threshold Criteria Met