ML20063D914
| ML20063D914 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 07/02/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-82-675-000 10CFR-50.55E, 17538, 82-08, 82-8, PT21-82-675, PT21-82-675-000, NUDOCS 8207130207 | |
| Download: ML20063D914 (4) | |
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@ Consumers Power James W Ceek Vice President - Projects, Engineering and Construction General Offices: 1945 West Pernell Road, Jackson, MI 49201 e (517) 78&O453 82-08 #1 July 2, 1982 Mr J-G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND PROJECT -
DOCKET NOS 50-329 AND 50-330 UPGRADE OF B&W NON-SEISMIC TRANSMITTERS MOUNTING BRACKETS FILE:
0.h.9.64 SERIAL:
17538 This letter is an interim 10 CFR 50 55(e) report concerning the. installation of B&W-supplied non-seismically qualified transmitter mounting brackets on seismic piping systems (specifically, reactor coolant pressure boundary piping). This concern was reported to Mr D Boyd, of your staff, in a telephone conversation on June 3,1982.
The following describes the concern created by the use of transmitters with non-seismic brackets and the corrective actions being taken to resolve this concern.
Table 1 (attached) lists the subject B&W-supplied transmitters (26 transmitters /
plant) and their functions. These transmitters form part of the reactor coolant system (RCS) pressure boundary through connecticas to various impulse lines. The Midland units have been designed to accommodate (through the make-up and purification system) single failures of RCS impulse line flow.
Multiple failures have not been analyzed.
Because these transmitters and associated mounting brackets are not seismically qualified, multiple failures could be postulated during a seismic event. The various combinations of multiple failures could result in small break loss-of-coolant accidents (LOCAs) which have not bec.n analyzed for the Midland units. In addition, failures of the non-seismic transmitters / brackets could have an adverse effect on the operation of any safety-related transmitter that uses the same piping.
The transmitters identified in Table 1 are required only to maintain RCS pressure boundary integrity and need not function before or after a seismic event.
In order to resolve these safety concerns, CPCo has requested 8207130207 820702 ON
{DRADDCK 05000?29 PDR
2 Serial 17538 82-08 #1 B&W to prepare a field change which will upgrade the transmitters mounting brackets to be seismically qualified as follows:
1.
replacing the non-seismically qualified mounting brackets with seismically qualified mounting brackets, and 2.
demonstrating the structural integrity of the existing transmitters to withstand a seismic event.
No details or firm schedule for accomplishing this proposal has been determined.
It is anticipated that further information regarding the corrective action will be available during August,1982.
Another report, either interim or final, will be sent by August 31, 1982.
l WES/1r Att ac hment :
- 1) Table 1, List of Transmitters of Concern CC: Document Control Desk, NRC Washington, DC 20555 RJCook, NRC Resident Inspector Midland Nuclear Plant CBechhoefer, ASLB Panel RSDecker, ASLB Panel FPCowan, ASLB Panel JHarbour, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CBStephens, USNRC WDPaton, Esq, USNRC FJKelley, Esq, Attorney General SHFrectan, Esq, Asst Att Gen WiiMarshall GJMerritt, Esq, TNK&J Great Lakes QA Managers
Serial 17538 82-08 #1 TABLE 1 B&W Tag Bechtel Tag Type Function Number Number N35Q7 Letdown Flow 1MU-FT8 1FT-0308 2MU-FT8 2FT-0408 N3BQ7 Makeup Tank Level 1MU-LT25-1 1LT-0325A iMU-LT25-2 1LT-0325B 2MU-LT25-1 2LT-0425A 2MU-LT25-2 2LT-0425B N3BQ7 Makeup Filter IMU-PDT22 1PDT-0322 Differential Pressure 2MU-FDr22 2PDT-0422 N3BQ7 Domineralizer Profilter 1MU-PDT11 1PDT-0315A Differential Pressure 2MU-PDT11 2PDT-0415A l
N3BQ7 Steam Generator Full ISP-LT9A5 1LT-3885A Range Level ISP-LT985 ILT-3885B 2SP-LT9A5 2LT-3985A 2SP-LT955 2LT-3985B N35Q7 Steam Generator ISP-LT9A4 1LT-3881A2 Startup Level 1SP-LT984 1LT-3881B2 2SP-LT9A4 2LT-3981A2 2SP-LT954 2LT-3981B2 N38Q8 RC Loop Flow 1RC-FT1A5 1FT-0101-A5 1RC-FT1A6 1PT-0101-A6 1RC-FT155 1FT-0101-B5 1RC-FT186 1FT-0101-B6 2RC-FT1A5 2FTM)201-A5 2RC-FT1A6 2FT-0201-A6 2RC-FT1B5 2FT-0201-B5 l
2RC-FT156 2FT-0201-B6 N3KS6 Nakeup Pump Discharge 1MU-PT42 IPT-0342 Head 2MU-PT42 2PT-0442 N3KS6 RC Pump Seal Inlet IMU-PT47 1PT-0347 Head 2MU-PT47 2PT-0447 N3KS6 Makeup Tank 1MU-PT26 1PT-0326 Pressure 2MU-PT26 2PT-0426
P ga 2 B W Tag Bechtel Tag Type Punction Number Number N3KS6 RC Pressure IRC-PT2-1 1PT-0102-1 (Narrow Range) 1RC-PT2-3 1PT-0102-3 2RC-PT2-1 2PT-0202-1 2RC-PT2-3 2PT-0202-3 N3ES6
.RC Pump Seal IRC-PT18Al-1 1PT-2366Al-1 Pressure IRC-PT18Al-2 1PT-2366Al-2 1RC-PT18A2-1 1PT-2366A2-1 1RC-PT18A2-2 1PT-2366A2-2 1RC-PT1881-1 1PT-2366B1-1 1RC-PT18B1-2 1PT-2366B1-2 1RC-PT18B2-1 IPT-2366B2 1RC-PT18B2-2 1PT-2366B2-2 2RC-PT18Al-1 2PT-2466Al-1 2RC-PT18Al-2 2PT-2466Al-2 2RC-PT18A2-1 2PT-2466A2-1 2RC-PT18A2-2 2PT-2466A2-2 2RC-PT18B1-1 2PT-2466B1-1 2RC-PT18B1-2 2PT-2466B1-2 2RC-PT1882-1 2PT-2466B2-1 2RC-PT18B2-2 2PT-2466B2-2
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