ML19345C781: Difference between revisions
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Cold shutdo a is defined, per the ANO-1 Technical Specifications, as the condition whereby the re ctor is subcritical by as least 1% A 'K/k and t is no more than 200 F. With a primary side temperature less av9 than or equal to 2000F, heat cannot be removed by the steam generators as the secondary side water would not boil. | Cold shutdo a is defined, per the ANO-1 Technical Specifications, as the condition whereby the re ctor is subcritical by as least 1% A 'K/k and t is no more than 200 F. With a primary side temperature less av9 than or equal to 2000F, heat cannot be removed by the steam generators as the secondary side water would not boil. | ||
: 2) Also, in the above case, the licensee does not conform to the Bulletin position that the cooldown shall be accomplished in 12 hours because the licensee's comitment is qualified by a statement "12 hours or at the maximum safe. rate". | : 2) Also, in the above case, the licensee does not conform to the Bulletin position that the cooldown shall be accomplished in 12 hours because the licensee's comitment is qualified by a statement "12 hours or at the maximum safe. rate". | ||
===Response=== | ===Response=== | ||
The AN0-1 emergency feedwater (EFW) syster consists, in part, of two ; | The AN0-1 emergency feedwater (EFW) syster consists, in part, of two ; | ||
EFW pumps. One pump is motor-driven r.hile the other is steam-driven. l IC/' If the flowpath containing the motor-driven pump is the one which is | EFW pumps. One pump is motor-driven r.hile the other is steam-driven. l IC/' If the flowpath containing the motor-driven pump is the one which is | ||
$33:/,E3jf9ii."' inoperable, a cold shutdown condition may not be attainable until l | $33:/,E3jf9ii."' inoperable, a cold shutdown condition may not be attainable until l this path is returned to operable. This occurs because main steam is I used to drive the steam-driven pump. Therefore, the qualifying state- ' | ||
this path is returned to operable. This occurs because main steam is I used to drive the steam-driven pump. Therefore, the qualifying state- ' | |||
'a c '"o c" 033 Glment | 'a c '"o c" 033 Glment | ||
~ | ~ | ||
"or at the maximum safe rate" would allow us the time necessary q to place a motor-driven pump in service. , | "or at the maximum safe rate" would allow us the time necessary q to place a motor-driven pump in service. , | ||
h | h | ||
... , = . .. c | ... , = . .. c hCl . b 1 | ||
hCl . b 1 | |||
a0220so 3 g p eA ,cu,, , , ur,, , ,ur,,, ,v ,,,, | a0220so 3 g p eA ,cu,, , , ur,, , ,ur,,, ,v ,,,, | ||
Q : '' | Q : '' | ||
. o t ,- | . o t ,- | ||
| Line 59: | Line 48: | ||
===Response=== | ===Response=== | ||
Because the main feedwater pumps (MFWP's) are turbine driven by main | Because the main feedwater pumps (MFWP's) are turbine driven by main | ||
. steam, cold shutdown cannot be achieved using only the MFWP's. It is, therefore, necessary to ha've in service either the motor-driven EFW pump or the motor-driven AFW pump in order to achieve cold shut- | . steam, cold shutdown cannot be achieved using only the MFWP's. It is, therefore, necessary to ha've in service either the motor-driven EFW pump or the motor-driven AFW pump in order to achieve cold shut-down. | ||
down. | |||
With regard to Item 10 of IE Bulletin 79-05A, our response dated April 16, 1979 states "ANO-1 Technical Specifications require that prior to initiating | With regard to Item 10 of IE Bulletin 79-05A, our response dated April 16, 1979 states "ANO-1 Technical Specifications require that prior to initiating | ||
. maintenance on safety-related components, the redundant component be demon-strated operable." AP&L believes, therefore, that we are in compliance with the bulletin requirements. | . maintenance on safety-related components, the redundant component be demon-strated operable." AP&L believes, therefore, that we are in compliance with the bulletin requirements. | ||
With regard to Item 4 of IE Bulletin 79-05B, we maintain our position that a manual trip on loss of offsite power is unnecessary. Furthermore, this manual trip would result in a reduction in the margin of safety. The unit is designed to runback to approximately 15% power. Initiating a manual trip would cause a loss of this potential power source and thus a reduction in the margin of safety. As stated in your evaluation, this runback is diffi- | With regard to Item 4 of IE Bulletin 79-05B, we maintain our position that a manual trip on loss of offsite power is unnecessary. Furthermore, this manual trip would result in a reduction in the margin of safety. The unit is designed to runback to approximately 15% power. Initiating a manual trip would cause a loss of this potential power source and thus a reduction in the margin of safety. As stated in your evaluation, this runback is diffi-cult to achieve. However, the consequence of not achieving the runback i<. | ||
cult to achieve. However, the consequence of not achieving the runback i<. | |||
a turbine _ trip, and thus a reactor trip. | a turbine _ trip, and thus a reactor trip. | ||
Very truly yours, l ~ | Very truly yours, l ~ | ||
7,, David C. Trimble Manager, Licensing DCT: MAS:pw | 7,, David C. Trimble Manager, Licensing DCT: MAS:pw dS$ | ||
dS$ | |||
4 | 4 | ||
'A l | 'A l | ||
; | ; | ||
) | ) | ||
- - .- .- _-}} | - - .- .- _-}} | ||
Revision as of 04:37, 31 January 2020
| ML19345C781 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 11/28/1980 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Novak T Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19345C782 | List: |
| References | |
| 1-110-28, IEB-79-05, IEB-79-05A, IEB-79-05B, IEB-79-5, IEB-79-5A, IEB-79-5B, NUDOCS 8012080342 | |
| Download: ML19345C781 (2) | |
Text
.. .'
'e ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK, ARKANSAS 72203 (501)371-4000 November 28, 1980 1-110-28 Mr. Thomas M. Novak Assistant Director for Operating Reactors Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Arkansas Nuclear One-Unit 1 Docket No. 50-313 micense No. DPR-51 Exceptions to IE Bulletin 79-05 (File: 1510.1,1510.3)
Gentlemen:
In accordance with your letter of June 13, 1980, the following is provided.
- 1) In addressing the case of one flow path being inoperable, the licensee's use of the term " cold shutdown" does not make it clear that the licensee is not relying on the SG for cooling.
Response
Cold shutdo a is defined, per the ANO-1 Technical Specifications, as the condition whereby the re ctor is subcritical by as least 1% A 'K/k and t is no more than 200 F. With a primary side temperature less av9 than or equal to 2000F, heat cannot be removed by the steam generators as the secondary side water would not boil.
- 2) Also, in the above case, the licensee does not conform to the Bulletin position that the cooldown shall be accomplished in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> because the licensee's comitment is qualified by a statement "12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or at the maximum safe. rate".
Response
The AN0-1 emergency feedwater (EFW) syster consists, in part, of two ;
EFW pumps. One pump is motor-driven r.hile the other is steam-driven. l IC/' If the flowpath containing the motor-driven pump is the one which is
$33:/,E3jf9ii."' inoperable, a cold shutdown condition may not be attainable until l this path is returned to operable. This occurs because main steam is I used to drive the steam-driven pump. Therefore, the qualifying state- '
'a c '"o c" 033 Glment
~
"or at the maximum safe rate" would allow us the time necessary q to place a motor-driven pump in service. ,
h
... , = . .. c hCl . b 1
a0220so 3 g p eA ,cu,, , , ur,, , ,ur,,, ,v ,,,,
Q :
. o t ,-
Mr. Thomas M. Novak November 28, 1980
- 3) The-licensee's procedures states that if both of the EFW pumps and the AFW pump are inoperable, the reactor will not be shutdown but rather, power will be reduced to less than 5% using the main feed-water pumps and maintained there until one of the EFW pumps or- the AFW pump' is made operable. Following that, the reactor will be placed in cold shutdown within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or at the maximum safe rate.
Response
Because the main feedwater pumps (MFWP's) are turbine driven by main
. steam, cold shutdown cannot be achieved using only the MFWP's. It is, therefore, necessary to ha've in service either the motor-driven EFW pump or the motor-driven AFW pump in order to achieve cold shut-down.
With regard to Item 10 of IE Bulletin 79-05A, our response dated April 16, 1979 states "ANO-1 Technical Specifications require that prior to initiating
. maintenance on safety-related components, the redundant component be demon-strated operable." AP&L believes, therefore, that we are in compliance with the bulletin requirements.
With regard to Item 4 of IE Bulletin 79-05B, we maintain our position that a manual trip on loss of offsite power is unnecessary. Furthermore, this manual trip would result in a reduction in the margin of safety. The unit is designed to runback to approximately 15% power. Initiating a manual trip would cause a loss of this potential power source and thus a reduction in the margin of safety. As stated in your evaluation, this runback is diffi-cult to achieve. However, the consequence of not achieving the runback i<.
a turbine _ trip, and thus a reactor trip.
Very truly yours, l ~
7,, David C. Trimble Manager, Licensing DCT: MAS:pw dS$
4
'A l
)
- - .- .- _-