ML20236A133
| ML20236A133 | |
| Person / Time | |
|---|---|
| Issue date: | 03/01/1989 |
| From: | Rosalyn Jones Office of Nuclear Reactor Regulation |
| To: | Hodges M Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8903160400 | |
| Download: ML20236A133 (7) | |
Text
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MAR 1 1989 MEMORhNDUMFOR:
M. W. Hodges, Chief Reactor Systems Branch Division of Engineering & Systems Technology FROM:
Robert C. Jones, Section Chief 1
Section B, Reactor Systems Branch Division of Engineering & Systems Technology
SUBJECT:
MINUTES OF JANUARY 17-19 MEETINGS WITH B&W ON THE TECHNICAL BASIS DOCUMENT From January 17 through 19, 1989, members of the staff met with B&W personnel to discuss the status of the Technical Basis Document (TBD) review and resolution of AT0G open items.
In attendance were Robert Jones and Warren Lyon (NRC), Ron Beelman (EG8G - NRC consultant), and Brent Brooks, Marty Parece and Robert Black (B&W). The meeting was held at the B&W offices in Lynchburg, VA.
1 The B&W Owners Group is planning a substantial upgrade of the TBD to make it a
" stand alone" document.
Included as part of this plan is the development of generic step-by-step procedure guidelines. Thus, the meeting discussions centered on identifying the ATOG open issues not previously resolved by the TBD and discussing whether and how the planned upgrade would resolve these l
issues.
In addition, some specific comments on the TBD and areas where the l
procedure guidance should be expanded were discussed.
Enclosed is a summary which was prepared and discussed with B&W to conclude the meeting.
Issue numbers provided on this summary relate to the numbering sequence in an annotated copy of the AT0G SER which was previously supplied by the staff. Major headings were developed to be consistent with the B&W Owners Group grouping of the open issues.
Highlights of this summary are:
I The current status of the AT0G open issues is:
60 issues remain open j
56 issues are closed 3 issuer will be deferred The open issues, including the issues related to the cooldown guidelines, are expected to be resolved as part of the planned upgrade. The deferred item are those items which are considered to be beyond the scope of coverage of the guidelines.
Some of the issues that were classified as closed will require some staff review to assure they properly reflect analysis results and are appropriately included in guidelines to be developed.
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4 M. W. Hodges The coverage of the planned upgrade to ATOG will cover all events which could occur when the reactor is hot and pressurized.
The guidelines will define actions to maintain clad integrity (r,esponse to Generic Letter RCS integrity and containment i
integrity.
Shutdown related procedures 88-17) will not be part of the planned upgrade, nor will severe core damage / major core reconfiguration events.
The staff also requested that the following issues be considered as part of the planned upgrade:
The conditions for keeping the RC pumps running with a saturated RCS, Adequacy and basis for the PTS curve, Generalization of actions to prevent and recover from a SG overfill
- event, Examine impact of ICC actions on SB tube integrity, Guidelines for addressing LOCA outside containment.
In addition, the guidance provided in the SGTR section of the TBD was discussed. This section will be revised to provide a generic accident mitigation strategy as opposed to the current write-up which allows the plants to weigh pros and cons of various mitigation strategies to allow development of plant procedures.
In addition, since steaming of the ruptured SG is expected as a part of the mitigation strategy, and thus will result in an offsite dose release, the staff stated that the B&W Owners Group will have to justify that the approach balances offsite risk and plant control difficulties when compared to possible alternate mitigation strategies (e.g., isolating of the ruptured SG).
Further meetings are planned to keep the staff informed of the progress and approach of the upgrade and to obtain staff feedback.
Robert C. Jones, Sectinn Chief Section B, Reactor Systems Branch Division of Engineering & Systems Technology
Enclosure:
As stated cc w/ enclosure:
A. Thadani DISTRIBUTION W. Lyon
' Central Files:
E. Tourigny PDR R. Black (B&W)
SRXB R/F D. Brooks (B&W)
RJones RJones R/F SR}y*S.gn RJDN 3// /89
ENCLOSURE l
MEETING
SUMMARY
1.
Entry Conditions / Coverage Coverage While Reactor Hot & Pressurized (Examine Equip Avail.)
Clad Integrity RCS Integrity i
Containment Integrity
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u Entry Conditions Rx Trip or Conditions Requiring Rx Trip Forced Shutdown for SGTR Upsets in Heat Transfer Forced Shutdown from other procedures - should have owners provide interface to TBD for abnormal conditions Not Covered Shutdown Issues - GL 88-17 Severe Core Damage / Reconfiguration Issues 90, 91, 4, 47, 48 remain open Will be addressed by upgraded procedures 2.
RCS Inventory lieasurement Will incorporate RVLIS stuff into guidelines. Will add discussions on RVLIS for ICC in TBD.
Staff finds RVLIS discussions in TBD generally OK.
Suggested look at Oconee E0P.
Issues 4a, 98 close 27 open 3.
RCP Operation i
Closed Issues #5 Covered by RCP Generic Letter
- 121 60 see to restors RCP service or trip pump - agreed obsolete (Part II AT0G) 4.
Loop /SB0 i
B&W agreed to add SB0 to TBD upgrade.
Open Issues 92, 93, 6, 7, 54, and 72 l
Item 110 - condenser issues - closed as resolved.
2-i 5.
Containment B&W agreed.to include containment guidelines as part of TBD upgrad.
NRC stated guidelines should include containment closure verification /
radioactivity control / containment heat removal /H control (although not to i
p severe core damage events).
l Issues still open:
79,42(partly), 43, 44, 45, 58, 106, 109, 31.
Items deferred:
41(venting) 42 (H flammability curves)-
2 NRC' Staff Action:
Get back to B&W on guidance for essential /non-essential containment penetrations.
6.
ATWS Issues Closed:
94/9 - resolved by ATOG supplement Issues Open:
- 53 - To be part of TBD upgrade guidelines Other Issues:
Consitt statement in guidelines re: RCS temperature control i
Look at conditions where AMSAC actions needed and perform manually NRC Action:
Establish position re: actions required to address SER supplements 7.
PTS Issue 33 Addressed by TBD i
Instructions on how to get out of PTS to be added I
Issue 10/95 Other:
B&W to reexamine adequacy of PTS Curve 8.
_Cooldown i
Issues 86/87/38 -
Staff expects this issue to be addressed in TBD upgrade.
l B&W stated not clear whether this was planned by BWOG.
Will discuss with OSC.
(0 pen)
Open - Staff suggested incorporation of RVLIS to check level in 35/89 hot leg
- Look at incorporating flow rate control for LPI to control vortexing/ flashing
- Address concerns on switchover (i.e., open valves slowly during switchover) l 37
- Open - B&W to factor Cyclic BC analysis results into guidelines i
yn Closed Issues 12 - non-item 19 - staff to assure incorporated in guidtlines 1
36.- closed / staff to confirrr. analysis l
103.- closed by TBD
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104-- closed (no longer applicable) 9.
Hpl Cooling 34/85/13/69/107 - open - analysis' completed - need to incorporate into guidelines 32/88 - closed - analysis complete /NRC to confirm i
'14 - closed l
I 15 - closed - (further examiliation ruay be needed for severe accidents) 1 51 - SBLOCA aspects - combine w/ item 12/ issue 70 ICC aspect - defer to accident management q
- 10. SGTR B&W believes SGTR guidance in TBD appropriately balances offsite dose consequence vis control problem / transient complications.
(DosesLow/TRACC ProvidesAppropriateBalance)
Action: NRC to get back to.B&W on general approach B&W to provide a specific SGTR mitigation strategy in guidelines (i.e., "best" j
path as opposed to options as currently in TBD) 78 - Open - generalized issue on SGTR. ' Scope expanded by TBD.
Needs to be l
put in guideline format.
25/17 - Closed - NRC suggested adding note referencing plant specific SG draining procedures and/or noting possibility of water hammer if steam lines not drained 18 - Open - Tc be addec to guidelines 20 - Closed - Analysis complete /NRC to confirm 21/22/49/23/67/24 - Closed by TBD. However must be incorporated into guidelines B3 - Closed - NRC to confirm analysis 50 - Opr - NRC requested examination of use of condensate booster puerps and TBV/ADV/MSSV control with this use i
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57/101
. Closed - (ur.necessary j
105 - Closed - (Obsolete)
- 11. Degraded Core
.96/29/39/108 - Open - To be covered by TBC within agreed upon scope of TBD upgrade Severe Accic'ent Issues deferred
- 12. RC Inventory / Pressure Closed - 114/115 121 (SER supplement) - considered closed by being addressed by other cyclic BC issues Open - 56 Guidelines to be prepared 70 Analyses not yet performed f.1/ M Analysis cortplete.
Need to incorporate into TBD and guidelines 55/81 Closed. NRC to confirm when in guideline form 13.
Calculation's(General) 59/60/61/62 - Closed - This was or.ly guicance on how to perform' analyses 65/64/80/84/66 - Closed - Analysis complete. NRC to confirm l
74 - Open - Incorporate into TBD and guidelines
- 14. miscellaneous 53/63 - Closed - Not an issue 99/100/102/113 - Open - Will be done in TBD upgrade l
112/116.- Closed - Not used in TBD (obsolete) 1/76/la/75/77/2/3 - Closed - Pre-implementation issues addressed by SER supplement.
Items 2 and 3 closed re: ATOG SER since upgrade is in progress i
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Other Issues
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k Consider effect of 100 actions, inost notably RCP restart, re: SG Tube
.j integrity
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SG overfill and recovery - appears addressed in SGTR.
Should be generalized in TBD upgrade Should actions for LOCA cutside containnient be addressed? NRC needs to develop position I
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