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400 Chestnut Street Tower II Acril 27, 1981 SCRD-50-328/81-17 Mr. Jses P. O m illy, Dirrter Offica cf Ir . ticri 3nd Enfor e nt U.S. :tcle' hegulatory Ccrnissicn Psyicn II | r: | ||
400 Chestnut Street Tower II Acril 27, 1981 SCRD-50-328/81-17 Mr. Jses P. O m illy, Dirrter Offica cf Ir. ticri 3nd Enfor e nt U.S. :tcle' hegulatory Ccrnissicn Psyicn II AJite 3100 101 ** rf.ta Street Atlanta Georgia 30303 | |||
==Dear Mr. O'Reilly:== | ==Dear Mr. O'Reilly:== | ||
SECLUIAi! SU1FAR PTIN? C! TIT 1 - EXdMive PFJh5Uw.; DPOPS ILPCS9 THE EPCf STPAHEPS - SCRD-50-328/B1 SIrelD nt"."In4 muc | SECLUIAi! SU1FAR PTIN? C! TIT 1 - EXdMive PFJh5Uw.; DPOPS ILPCS9 THE EPCf STPAHEPS - SCRD-50-328/B1 SIrelD nt"."In4 muc | ||
'Ihe m2bject deficiency wan initially recorted to 'IPC-CIE Instecter P. 'i. | |||
Wri?.t en 7anuary 20, 1981., in | Wri?.t en 7anuary 20, 1981., in acccr erce ith 10 CFo 50.55(e) es tr t SP.! | ||
MEB 8006R1. A fi.rst interin revert tas cubaitt** on "ebruary 27, 1481 Encle-ed is our enm.! interin recort. "* e s'25"ittel dete of thi.9 reecrt | e MEB 8006R1. A fi.rst interin revert tas cubaitt** on "ebruary 27, 1481 Encle-ed is our enm.! interin recort. "* e s'25"ittel dete of thi.9 reecrt was caretvi t.o by R. V. Crlenjak en Acril 1, 1991 end D. 02ick en April 14, 1981. Ne c::cect to cubmit cur, next retort by ''ay 26, 1981. t'e censider 10 CFR 21 aoplic*ble to this deficiency. | ||
If you have any questions, please get in touch trith D. L. Tr~t%rt at FIS 857-2581. | If you have any questions, please get in touch trith D. L. Tr~t%rt at FIS 857-2581. | ||
Vorv truly yours, TENNESSEE VAILEY Ainmturl L. M. Mills, Manager thaclear "agulation and Safety Enclosure | Vorv truly yours, TENNESSEE VAILEY Ainmturl L. M. Mills, Manager thaclear "agulation and Safety Enclosure Mr. Victor Stello, Director (Ehclosure)! | ||
Office of Inspection and Enforcement U.S. Nuclear Regulatory Cemnission | cct Office of Inspection and Enforcement U.S. Nuclear Regulatory Cemnission Washington, DC 20555 l | ||
96H 8'" " \\*n P00R ORIGINAL s | |||
4 ah ENCICSURE SEQUOYAH NtXIFAR PIANT UNIT 2 EXCESSIVE PR'.SSURE DROPS ACRCES 'HE EICW STRAINERS SQRD-50-328/81-17 10 CFR 50.55(e) | |||
'SECOND INTERIM REPORP Description of Deficiency During preoperational testing at Sequoyah unit 1, it was discovered that pressure drops existed in excess of that designed for across the Essential Raw Cooling Water System (ERCW) strainera. | |||
S. P. Kinney Engineering in Carnegie, Pennsylvania, supplied these strainers and predicted their pressure drop. 'Ihe actual pressure drop was much larger than the stated value. As a result, reduced flow rates could occur due to increased systen resistance. 'Ihe total system pressure drop for unit 1 has been determined to be acceptable; however, the acceptability of two-unit operation has not yet been established. | |||
Description of Deficiency During preoperational testing at Sequoyah unit 1, it was discovered that pressure drops existed in excess of that designed for across the Essential Raw Cooling Water System (ERCW) strainera. S. P. Kinney Engineering in Carnegie, Pennsylvania, supplied these strainers and predicted their pressure drop. 'Ihe actual pressure drop was much larger than the stated value. As a result, reduced flow rates could occur due to increased systen resistance. 'Ihe total system pressure drop for unit 1 has been determined to be acceptable; however, the acceptability of two-unit operation has not yet been established | Interim Progress The flow rates for several conponents cooled by the ERCWS required for safe shutdown of the plant were not met during preoperational testing. A portion of this flow rate deficiency can be attributed to the excessive pressura drop across che ERCW st.rainers. TVA has reduced the flow requirements of the ERCW syste. as discussed in NCR SQN SWP 8107 (SQRD 328/81-22) As a result, the system should be capable of supporting two-unit operation without replacing the strainers. The flow testing presently in progress should verify the system adequacy. If the ongoing tests do not verify system adequacy, the NRC will be notified before unit 2 fuel load. | ||
Interim Progress The flow rates for several conponents cooled by the ERCWS required for safe shutdown of the plant were not met during preoperational testing. A portion of this flow rate deficiency can be attributed to the excessive | |||
i,}} | i,}} | ||
Latest revision as of 11:11, 23 December 2024
| ML20005A331 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/27/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, SQRD-50-328-81, NUDOCS 8106300197 | |
| Download: ML20005A331 (2) | |
Text
I-a l.3.H I
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~
r:
400 Chestnut Street Tower II Acril 27, 1981 SCRD-50-328/81-17 Mr. Jses P. O m illy, Dirrter Offica cf Ir. ticri 3nd Enfor e nt U.S. :tcle' hegulatory Ccrnissicn Psyicn II AJite 3100 101 ** rf.ta Street Atlanta Georgia 30303
Dear Mr. O'Reilly:
SECLUIAi! SU1FAR PTIN? C! TIT 1 - EXdMive PFJh5Uw.; DPOPS ILPCS9 THE EPCf STPAHEPS - SCRD-50-328/B1 SIrelD nt"."In4 muc
'Ihe m2bject deficiency wan initially recorted to 'IPC-CIE Instecter P. 'i.
Wri?.t en 7anuary 20, 1981., in acccr erce ith 10 CFo 50.55(e) es tr t SP.!
e MEB 8006R1. A fi.rst interin revert tas cubaitt** on "ebruary 27, 1481 Encle-ed is our enm.! interin recort. "* e s'25"ittel dete of thi.9 reecrt was caretvi t.o by R. V. Crlenjak en Acril 1, 1991 end D. 02ick en April 14, 1981. Ne c::cect to cubmit cur, next retort by ay 26, 1981. t'e censider 10 CFR 21 aoplic*ble to this deficiency.
If you have any questions, please get in touch trith D. L. Tr~t%rt at FIS 857-2581.
Vorv truly yours, TENNESSEE VAILEY Ainmturl L. M. Mills, Manager thaclear "agulation and Safety Enclosure Mr. Victor Stello, Director (Ehclosure)!
cct Office of Inspection and Enforcement U.S. Nuclear Regulatory Cemnission Washington, DC 20555 l
96H 8'" " \\*n P00R ORIGINAL s
4 ah ENCICSURE SEQUOYAH NtXIFAR PIANT UNIT 2 EXCESSIVE PR'.SSURE DROPS ACRCES 'HE EICW STRAINERS SQRD-50-328/81-17 10 CFR 50.55(e)
'SECOND INTERIM REPORP Description of Deficiency During preoperational testing at Sequoyah unit 1, it was discovered that pressure drops existed in excess of that designed for across the Essential Raw Cooling Water System (ERCW) strainera.
S. P. Kinney Engineering in Carnegie, Pennsylvania, supplied these strainers and predicted their pressure drop. 'Ihe actual pressure drop was much larger than the stated value. As a result, reduced flow rates could occur due to increased systen resistance. 'Ihe total system pressure drop for unit 1 has been determined to be acceptable; however, the acceptability of two-unit operation has not yet been established.
Interim Progress The flow rates for several conponents cooled by the ERCWS required for safe shutdown of the plant were not met during preoperational testing. A portion of this flow rate deficiency can be attributed to the excessive pressura drop across che ERCW st.rainers. TVA has reduced the flow requirements of the ERCW syste. as discussed in NCR SQN SWP 8107 (SQRD 328/81-22) As a result, the system should be capable of supporting two-unit operation without replacing the strainers. The flow testing presently in progress should verify the system adequacy. If the ongoing tests do not verify system adequacy, the NRC will be notified before unit 2 fuel load.
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