ML20005E887

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Forwards Description of New Displays & Other SPDS Mods, Including Addition of Radioactivity Status Safety Function Display to SPDS & Mod to Erfdads Software.Mods Will Be Completed During First Refueling Outage
ML20005E887
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 01/05/1990
From: Mcburnett M
HOUSTON LIGHTING & POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ST-HL-AE-3320, NUDOCS 9001120032
Download: ML20005E887 (17)
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Wpy."w The Light u  : co mp a nySuth Temas Project Electric Generating P. O.Station Box 289 - Wadworth, Texas m83 -

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ST-HL-AE-3320 m,'* File No,'; G4 '. 2 ,

J41.3,- C9.17-

,W # '10CFR50

[M U..S.. Nuclear Regulatory Commission h (Attention: Document Control Desk

Washington, DC

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'O .g South Texas Project Electric Generating Station -!

l Units 1 and 2

, Docket Nos. STN 50-498, STN 50 499 Completion of Modifications to the Safety Parameter-

.Disolav System (SPDS) for the First Refuelinn Outane-

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Reference:

A. Issuance of Facility License No. NPF-71, South Texas Project Unit 1;--D. M. Crutchfield, NRC; Letter to J. H. Goldberg, 4 ,

HL&P; August 21,.1987.

, ,3 B. Safety Evaluation Report Related to the Operation of South i1 . Texas Project Units 1 and 2, NUREG-0781, Supplement No. 4, 4

July 1987.

3 C. Safety Parameter Display System (SPDS); M. A. McBurnett, HL&P; Letter to the NRC; March'18, 1988; ST-HL- AE- 25 89.

D. Safety Evaluation Report Related to the Operation of South j g Texas Project Units 1 and 2 NUREG-0781, Supplement No. 6, '

C December 1988.

E. Modifications to the Safety Parameter Display System (SPDS); :j M. A. McBurnett, HL&P; Letter to the NRC; February 2, 1989; -1 ST-HL-AE-2962.  !

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I' :- i THC/SPDS1289.LTR 9001120032 900105 1 PDR p

ADOCK 0500C498 FDC M.3 J A Subsidiary of Houston Industries incorporated ' I l

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. Houston Lighting & Power Company South Texas Project Electric Generating Station sT-n-a-332o File No.: 04.2 J41.3, 09.17 Fase 2 of 4 4

F. Submittal of Safety Parameter Display System (SPDS) Safety Analysis Report; M. ' R. Wisenburg, HL&P; Letter to Vincent S.

Noonan, NRC; December 23, 1986; ST-HL AE-1861.

The Safety Parameter Display System (SPDS) provides a display-of plant parameters from which the safety status of the plant may be assessed both

.during normal / abnormal operation and emergency conditions. The primary function of the SPDS is to help operating personnel in the Control Room make quick assessments of plant safety status. The SPDS displays are designed in accordance with NUREG-0696 and NUREG-0700.

In Reference A, the NRC identified a license condition regarding the SPDS that HL&P was required to satisfy prier to startup after the first refueling outage. ~ This license condition referenced five actions which are shown on page 18-9 of-SSER 4 (Reference B). In Reference C, HL&P provided detailed descriptions of actions taken to resolve items 2 through 5, SSER-6

-(Reference D) subsequently closed these four items.

Item 1 required modification of tne critical safety function displays to provide the status of the radioactivity control safety function and to continuously display the status boxes that summarize plant safety status.

These modifications were completed on Unit 1 prior to startup from its first-refueling outage.

Attachment I provides a detailed description of the SPDS modifications ,

which added two displays for Radioactivity Status. This attachment also describes the additional modifications required to other displays as a result of the new radioactivity status displays. Attachment II provides a description of SPDS keyboard and keypad modifications required as a result of the addition of the two new Radioactivity Status SPDS displays.

Attachments I and II also contain a description of the modifications to the SPDS software and keyboards to provide continuous display of the safety status indicators on a dedicated SPDS CRT.

The completion of'these modifications fullfills HL&P's previous commitments outlined in Reference E and provides the final closcout for the license conditions, for Unit 1, associated with the NRC audit of the SPDS.

These same modifications will be performed on Unit 2 during its first refueling outage.

As a result of various observations by the NRC, HL&P Engineering, HL&P Operations, and the SPDS Man-in-the Loop Validation Testing, several Human Engineering Discrepancies (HEDs) have been identified against the SPDS

' displays. An extensive review of the SPDS displays, considering these HEDs, the STP CRDR criteria, and technical correctness, has recently been completed.

The SPDS revisions to address these HEDs and the results of this review are TliC/SPDS1289.LTR

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Houston Lighting & Power Company

South Texas Project Electric Generating Station 37.uL- a -as2o File No.
. G4.2 J41.3, C9.17 Page 3 of 4 being treated as Category C HEDs, and are scheduled to be completed prior to startup from the third refueling outage of Unit 1 and the second refueling ,

outage of Unit 2. The SPDS Safety Analysis Report (originally provided by' Reference F) .will be updated and submitted to the NRC upon completion of these modifications.

If you should have any questions on this matter, please contact Mr. A.

'W.-Harrison at (512) 972-7298.

cB nett Manager, Licensing THC/

Attachments: I. Description of New Displays and other SPDS Display Modifications II. Description of Keyboard Modifications l

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South Texas Project Electric Generating Station J41,3, G9.17 Page 4 of 4 cc

Regional Administrator, Region IV Rufus S. Scott Nuclear Regulatory Cormission Associate General Counsel

.611 Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company I Arlington, TX 76011 P. 0. Box 61867 Houston, TX 77208 George Dick, Project Manager U.S. Nuclear Regulatory Commission INPO l

-Washington, DC 20555 Records Center 1 1100 circle 75 Parkway

'J.'I. Tapia Atlanta, GA 30339-3064

. Senior Resident Inspector ,

c/o U. S. Nuclear Regulatory; Dr. Joseph M. Hendrie l Commission 50 Be11 port Lane P. O. Box 910 Be11 port, NY. 11713 Bay City, TX 77414-D. K. Lacker J. R. Newman, Esquire Bureau of Radiation Control Newman & Holtzinger, P.C. Texas Department of Health 1615 L Street, N.W. 1100 West 49th Street Washington, DC 20036 Austin, TX 78704 D. E. Ward /R. P. Verret  ;

Central' Power & Light Company 'i P. O. Box 2121 Corpus Christi, TX 78403 J. C. Lanier Director of Generation City of Austin Electric Utility 721 Barton Springs Road Austin, TX .78704 R. J. Costello/M. T. Hardt ,

City Public Service Board j P. O. Box 1771 i San Antonio, TX 78296 i

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li Attachment I ST-HL-AE-3320 Page 1 of 3-DESCRIPTION OF NEW DISPLAYS AND OTHER'SPDS DISPLAY MODIFICATIONS Addition of Radioactivity Status Safety Function Display to the Safety Parameter _ Display System  !

.Two new displays were added to the Safety Parameter Display System (SPDS)'to provide the radioactivity control status safety function, to address the NRC concerns with the requirements of Supplement 1 to NUREG 0737. The two new displays are identical and are titled Radioactivity Status. The names for [

these two displays are NRAD (Normal Radioactivity Status) and CRAD.(Critical

,, Radioactivity Status).

To develop these displays, a review was performed by Engineering and l

, Operations' personnel to determine which radiation monitors provided the most useful information relative to the plant radioactivity status. This review

. also considered uses of radiation monitors in accident type determination.

The following radiation monitors were selected for these displays:

1. RCB-Purge I 2, Control Room /EAB Vent
3. Spent Fuel Pool Exhaust
4. Unit Vent. Exhaust l
5. RCB Atmosphere  :

6, Containment High Range Area Radiation I

7. Condenser Vacuum Pump Exhaust
8. Main Steam Line

'9. -Steam' Generator Blowdown The_ normal radioactivity [NRAD) and critical radioactivity (CRAD) }

displays are shown in Figures I-1 and I-2, respectively. These displays have  ;

a'similar layout to the other SPDS displays. The top left box of each display j contains the display mnemonic, the display number, and South Texas Project '[

(STP) unit number. The top middle box of each display contains the display

'name. The top right box of each display contains the date, time, and the l plant operational mode.  !

The bottom left section of the displays contains the status indicators  ;

for the Normal Safety Functions (NSF) and Critical Safety Functions (CSF) . l The computer displays the NSF or CSF indicators based on the position of the reactor trip breakers. The NSF indicators are displayed if the reactor trip breakers are closed. The CSF indicators are displayed if the reactor trip breakers are open.

The center bottom section of each display is reserved for the system detail function. The bottom right section displays the Emergency Response THC/SPDS1289 I

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L" health" via .an alpha / color-cued . indicator.

The middle section.of the Radioactivity Status displays provides the readings of the nine: radiation monitors listed above in three rows of three, based on similarity-of information provided and type of accident and/or-_ ,

g; release for which they provide a response or information. The overall format

of these displays was coordinated with the Operations Department and reviewed ,

in accordance with the'STPEGS Control Room Design-Review (CRDR) program. '

L-L The top three radiation monitors on the NRAD and CRAD displays,-RCB PURGE, CR/EAB VENT, and SFP EXHAUST, are ESF actuation monitors and provide automatic responses to accidents.

L" The middle three. radiation monitors, UNIT VENT, RCB ATMOSPHERE, and CNTMT HI RANGE, are release / containment monitors. These monitors provide- -

information.regarding~ breaches of the reactor coolant system boundary and

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regarding releases from the plant to offsite.

^ The bottom three radiation monitors, COND VAC PUMP, MAIN STM LINE, and- '

SG BLOWDOWN, provide information useful in identifying-a steam generator, tube = ,

rupture accident. [

t Modifications to Other Displays The addition of the radioactivity control safety function also required the revision of the other SPDS and ERFDADS displays.

t Both. the Top Level Normal Safety Function (TOP-N) and Top Level Critical L Safety Function (TOP-C) displays previously contained six status bars, one for each.of the six safety functions, Suberiticality '[S), Core Cooling [C), Heat ,

Sink [H).. Integrity [P),-Containment [Z), and Inventory [1]. A status bar for Radioactivity (R) has been added to both the TOP-N and TOP-C displays. This status bar is located at the right of the display, separated from the other six safety function bars. It.is identified underneath with an "R", a solid triangle status indicator, and " RAD". ' Figures I 3 and I-4 show the revised TOP-N AND TOP-C displays, respectively.

All SPDS and ERFDADS displays containing the safety status boxes were also revised to include the Radioactivity [R) status indicator. This status indicator was added in the bottom left section, as a solid triangle to the right of the six safety function boxes with the letter "R" to the right of the triangle. Figure I-5 shows a typical display with the addition of the radioactivity safety status indicator.

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E ' Modification to ERFDADS Software for Determination of Radioactivity Status Bar'

. Height and Status Indicator Color-The color of. the radioactivity status triangle and the color and height I of'the status bar are determined in a manner similar to.the NSF-status bars-and colors.- For each of the radiation monitors on'the Radioactivity Status displays, the reading is' compared to predetermined normal, alert, and alarm values-for that monitor,'and a " normalized"~ reading is generated.

The bar' length for the top level radioactivity. status normal safety I e function' is calculated by the sof tware as the largest " normalized" difference of-the radiation monitor value from its predetermined normal value. The color-of the radioactivity status bar and the status triangle changes as a function.

of the highest alarm level-reached by any.of the radiation monitors. ,

Modification to ERFDADS for Continuous Display of Safety Function Status p.

The ERFDADS'has been modified so.that one display CRT, identified as the.

SPDS Dicplay,'can only bring up displays which have the safety function status

-indication as part of the display. Appropriate keyboard modifications were-c i -- also.made as a result of this change (See Attachment 11).

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g DESCRIPTION OF KEYBOARD MODIFICATIONS  ;

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Keyboard Modifications for. Radioactivity Status Safety Function Displays

.The addition of the. two radioactivity status displays, normal radioactivity status [NRAD) and critical radioactivity status [CRAD),

discuss'ed in Attachment I,-~resulted in modifications to the' keyboards and .!

keypads' associated with the Emergency Response Facilities Data Acquisition and Display System (ERFDADS) cathode ray tubes (CRT).

The function keys on the keyboards and keypads are. closely linked to the: ,

alsplays. The normal safety functions (NSF) and critical safety functions ,

.(CSIT have one-top level display each. The operator.can select the top, level displsy via a single keystroke by pressing the-" TOP" key. The computer .,

selecr.s the NSF or CSF top level display based on the status of the renctor '

trip _1reakers. In a similar-manner, the operator can select the mid level >

1 displeys via a single-keystroke. The function' keys are labeled "S" for'

- .H Suberiticality, "C" for Core Cooling, "H" for Heat Sink, "P" for Integrity, '

"Z"..for Containment, and "I" for Inventory. Again the computer selects the appropriate NSF or CSF display based on the status of the reactor trip 4 breakers. A< seventh mid-level function key, "R" for Radioactivity, has been '

-added to both the keyboards and keypads. This function key allows the .

. operator to call-up the appropriate Radioactivity-Status display by single keystroke. access. 1 The revised keyboard and keypad layouts are sh'own on Figures 11-1 and II-2, respectively.

i The mid-level function key "R" is located on the keyboards to the right of function key "I".. The seven mid-level function keys are located together

.at the top left of the keyboards. 'l .

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'The mid level function key "R" is located on the keypads to the right of j function key-"I". The seven mid-level function keys are located within the top two rows of the left face of the keypads. -!

Keyboard Modifications for Permanent Display of Safety Status Indication The SPDS has also been modified to permanently display the safety status boxes on one of the SPDS consoles. There are six ERFDADS CRTs in the Control Room (See Figure 11-3). Software and hardware changes have been implemented to allow the continuous display of information from which the safety status of the plant can be assessed. The left ERFDADS CRT located on the front of THC/SPDS1289.II

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(':0 10perator. Console CC020 has been designated as-the SPDS Display;and has been.

[ 'restrictedLto access only displays'containing the safety _ status _ indicators. '

f" .These safety status-indicators are- provided in the left bottom corner of each-

[I -display (See Attachment 1). I l 4 Access to this_CRT is'possible via,the two keyboards.provided on the two. <

consoles . ; Keys:on these keyboards have been color-coded.to show.the-keys that:

are' operational ~when_ accessing this dedicated CRT.

If a display not .

containing the safetycstatus-indicators 11s requested on'this CRT, .the CRT will'- ,

not' respond and will maintain-the current display until:an allowed display ,

~(i . e a , ERFDADS: display containing safety status indicators) is requested'.

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