ML20078C533
| ML20078C533 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/19/1995 |
| From: | Shell R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9501260374 | |
| Download: ML20078C533 (3) | |
Text
,
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1A Tennessee Valley AJthonty, Post Othce Box 2000. So:!dy-Daisy. Tennessee 37379 I
January 19,1995 i
4 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 l
i Gentlemen:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SON) - SUPPLEMENTAL INFORMATION FOR TS CHANGE 94-16 l
Reference:
TVA Letter to NRC dated December 16,1994, "Sequoyah Nuclear l
Plant (SON) - Technical Specification (TS) Change 94-16,
' Deletion of 900 Revolutions Per Minute (RPM) Requirement for i
the Diesel Generator (D/G) Surveillances'"
TVA submitted a TS change request to NRC by the above reference to remove the 900 rpm requirement from applicable surveillance requirements, in addition, the removal of a requirement to perform interdependence D/G testing 5
during shutdown conditions was proposed. On January 11,1995,NRC l
notified TVA that supplemental information regarding the emergency
]
capabilities of the D/Gs during the interdependence tests would be required to support approval of the subject TS change request. This submittal provides the required information to support the proposed TS change request.
i The interdependence tests for the D/Gs are required to be performed on an interval of 10 years or after modifications that could affect D/G 1
interdependence. This test is performed with the D/Gs in their normal standby condition required by TS limiting conditions for operation. The D/Gs are given an emergency start signal, which actuates a common start relay and initiates -
the start of the four D/Gs. During the monthly start tests the D/Gs are given similar start signals, but a test switch is placed in " test" to limit the start signal to the D/G being tested. The interdependence test is performed with this switch in normal and maintains the D/Gs in a condition identical to the normal standby configuration. At all times during the interdependence test the D/Gs 2500/.5 gi o 9501260374 950119 i
PDR ADOCK 05000327 P
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4 U!S. Nuclear Regulatory Commission Page 2 January 19,1995 i
are capable of accepting emergency loads upon the occurrence of a blackout condition on any or all 6.9 kilovolt shutdown boards. The breaker.
configurations are not altered during this test and the D/Gs are considered J
l operable. The impact of this test on D/G safety functions is that the D/Gs l
have already completed the 10-second start and acceleration to rated speed and voltage and are available for subsequent automatic loading.
Therefore, the removal of the requirement to perform the interdependence tests during shutdown conditions does not reduce nuclear safety and may improve D/G response to enhance accident mitigation capabilities.
There are no commitments contained in this submittal. Please direct questions concerning this issue to Keith Weller at (615) 843-7527.
Sincerely, j
R. H. Shell
(
Manager l
SON Site Licensing l
cc: See page 3 l
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U.S. Nuclear Regulatory Commissior, g
l Page 3 Y
January 19,1995 1
cc: Mr. D. E. LaBarge, Project Manager Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident inspector Sequoyah i4uclear Plant 26001 0e Ferry Road 9
I Soddy-Daisy, Tennessee 37379-3624 Regional Administrator l
U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 I
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