ML20210P663
| ML20210P663 | |
| Person / Time | |
|---|---|
| Site: | 05532443 |
| Issue date: | 08/11/1999 |
| From: | Hironori Peterson NRC |
| To: | |
| Shared Package | |
| ML20210P659 | List: |
| References | |
| 99-755-01-SP, SP, NUDOCS 9908130057 | |
| Download: ML20210P663 (5) | |
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l UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION l
l BEFORE THE PRESIDING OFFICER l
l In the Matter of ) Docket No. 55-32443-SP
)
MICHEL A. PHILIPPON )
- ) ASLBP No. 99-755-01-SP
( (Denial of Senior Operator )
i License Application) )
l l
NRC STAFF RESPONSE TO JULY 30,1999,
- QUESTIONS BY THE PRESIDING OFFICER l
IN THE FORM OF AN AFFIDAVIT BY HIRONORI PETERSON l STATE OF ILLINOIS )
l ) ss:
l COUNTY OF DUPAGE )
I l l
Hironori Peterson, first being duly sworn, deposes and states:
l
- 1. My name is Hironori Peterson. I hereby incorporate by reference the t
statements of my employment, qualifications, and connection to this proceeding contained in and attached to my affidavit of February 11,1999, submitted as part of the NRC Staffs Response to Written Presentation By Michel A. Philippon (February 12, 1999).
9908130057 990812 PDR MISC 9908130056 PDR i
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- 2. The following are the Staff's responses to the additional questions, l
. directed to the Staff, contained in the Order of the Presiding Officer (July 30,1999). I These responses have been prepared in collaboration with Mr. David Hills, Chief of the f
l Operations Branch, NRC Region III, and Mr. Lawrence Vick, Reactor Engineer 1
(Examiner Qualified), Division of Inspection Program Management, Office of Nuclear
! Reactor Regulation.
l ANSWERS I
Answer to the First Ouestion Directed to NRC Staff: The torus is designed to i
l withstand the thermal stresses of an emergency depressurization from full operating i reactor pressure as long as torus water level and torus water temperature are within the I
heat capacity limits and design parameters. However, thermal stresses can be reduced I
by depressurizing from a lower reactor pressure by using the main turbine bypass 1
valves, thereby diverting the heat energy addition away from the torus prior to a l required emergency depressurization into the torus. In the case of Scenario 2, without l the capability of the turbine bypass valves, the appropriate actions would have been the following: (1) continued actions to attempt to isolate the torus leak; (2) continued actions to restore non-essential power to recover high pressure reactor coolant system water injection and main turbine bypass valve capabilities; and (3) controlled reduction in reactor pressure in small increments (100 psig) by operating different relief valves one at a time allowing the torus water cooling system to better dissipate (distribute) the thermal energy inside the torus.
l L
i 4
The Staff's Affidavit dated April 16,1999, responding to the Presiding Officer's initial i
questions, also elaborates on the above issues of pressure control and reducing thermal l stress. The April 16 affidavit provides further details concerning depressurization and thermal stress starting on page 20, line 21, and ending on page 22, line 10. Further details concerning the more controlled pressste reduction are provided in the April 16 affidavit from page 24, line 21, to page 25, line 12. In addition, the Staff's answers to questions 28 and 29 (pages 29 to 32), in the April 16 affidavit. provides additional l details concerning the reactor's response to the thermal stresses experienced during the scenario.
Answers to Ouestions Directed to NRC Staff and Mr. Philipoon Answer to Ouestion 1: No, step 4.11 of General Operating Procedure (GOP) 22.000.04, " Plant Shutdown From 25% Power," (Hearing File Reference Material Item
- 6), does not direct the operator to set the mode switch to STARTUP (Operational Mode 2). Step 4.18, " Perform the following to enter Mode 2," of GOP 22.000.04 directs the l actions necessary prior to placing the mode switch to STARTUP.
l Answer to Suboart (a): The operating procedure pertaining to the shutdown and subsequent actions to place the mode switch to STARTUP is GOP 22.000.04, step 4.18.
l l
Answer to Suboart (b): No, the mode switch was not set to STARTUP at step 4.11 of GOP 22.000.04.
Answer to Suboart (c): The mode switch was in the position of RUN (Operational Mode 1).
l l
Answer to Subpart (d): At the start of the shift, the mode switch was in the position of RUN. ,
Answer to Suboart (e): At the termination of the scenario, the mode switch was in the position of SHUTDOWN following the reactor trip on loss of offsite power.
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The foregoing is true and correct to the best of my knowledge, information, and belief.
, , /mM 0 - .
Hironori Peterson Subscribed and sworn to before me this //kay of August 1999.
r===:========,
0 "OFFICI AL SEAL"l '
f)h) / _ f,9M ll ROWLENE WENDOLL If
.~ l Notary Public ,' MY COMMISSION EXPIRES 3n8/200
===========-6 My commission expires: /20/O2
[i UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION g DOCKEIED l USHRC BEFORE THE PRESIDING OFFICER In the Matter of )
99 AUG 12 P4 :18
) '
MICHEL A. PHILIPPON ) Docket No. 55-32443-SPJR-L RU;
) ' h-ADJ W (Denial of Senior Reactor Operator )
License Application) ) .
CERTIFICATE OF SERVICE l
I hereby certify that copies of"NRC STAFF'S ANSWERS TO JULY 30,1999 QUESTIONS l BY THE PRESIDING OFFICER"in the above-captioned proceeding have been served on the I following by deposit in the Nuclear Regulatory Commission's internal mail system, or as indicated by a single asterisk by ovemight mail, or as indicated by a double asterisk by hand delivery, this 12th day of August 1999:
Administrative Judge Adjudicatory File (2)
Thomas S. Moore Atomic Safety and Licensing Board Presiding Officer Mail Stop: T-3 F23 Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission Mail Stop T-3 F23 Washington,DC 20555 U.S. Nuclear Regulatory Commission Washington, DC 20555 Atomic Safety and Licensing Board FAX: 301-415-5595 Panel Mail Stop: T-3 F23 Administrative Judge U.S. Nuclear Regulatory Commission Dr. Charles N. Kelber Washington,DC 20555 Special Assistant Atomic Safety and Licensing Board Secretary (2) *
- Mail Stop T-3 F23 Attn: Rulemakings and U.S. Nuclear Regulatory Commission Adjudications Staff Washington, DC 20555 Mail Stop: OWFN-16 C1 U.S. Nuclear Regulatory Commission Michel A.Philippon* Washington,DC 20555 13871 Capernall Road Carleton, MI48117 FAX (Fermi control room): j (313) 256-4718 g Office of Commission Appellate Co nse fo C Staff Adjudication Mail Stop: OWFN-16 C-1 U.S. Nuclear Regulatory Commission Washington,DC 20555 4